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https://github.com/moparisthebest/JdbcMapper
synced 2024-11-22 09:02:17 -05:00
Initial CompilingResultSetMapper implementation
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package com.moparisthebest.jdbc;
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import com.moparisthebest.classgen.Compiler;
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import java.sql.ResultSet;
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import java.util.Calendar;
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import java.util.HashMap;
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import java.util.Map;
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public class CompilingResultSetMapper extends ResultSetMapper {
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protected final Compiler compiler = new Compiler();
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protected final Map<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>> cache = new HashMap<CachingRowToObjectMapper.ResultSetKey, CompilingRowToObjectMapper.ResultSetToObject<?>>();
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public CompilingResultSetMapper(Calendar cal, int arrayMaxLength) {
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super(cal, arrayMaxLength);
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}
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public CompilingResultSetMapper() {
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super();
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}
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@Override
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protected <T> RowToObjectMapper<T> getRowMapper(ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType) {
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return new CompilingRowToObjectMapper<T>(compiler, cache, resultSet, returnTypeClass, cal, mapValType);
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}
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}
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package com.moparisthebest.jdbc;
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import com.moparisthebest.classgen.Compiler;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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import java.sql.ResultSet;
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import java.sql.ResultSetMetaData;
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import java.sql.SQLException;
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import java.util.Calendar;
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import java.util.Map;
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/**
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* Created by mopar on 5/16/17.
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*/
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public class CompilingRowToObjectMapper<T> extends RowToObjectMapper<T> {
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protected final Compiler compiler;
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protected final ResultSetToObject<T> resultSetToObject;
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protected String[] keys = null; // for caching if we must generate class
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public CompilingRowToObjectMapper(final Compiler compiler, final Map<CachingRowToObjectMapper.ResultSetKey, ResultSetToObject<?>> cache, ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType) {
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super(resultSet, returnTypeClass, cal, mapValType);
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this.compiler = compiler;
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try {
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final CachingRowToObjectMapper.ResultSetKey keys = new CachingRowToObjectMapper.ResultSetKey(super.getKeysFromResultSet(), _returnTypeClass);
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//System.out.printf("keys: %s\n", keys);
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@SuppressWarnings("unchecked")
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final ResultSetToObject<T> resultSetToObject = (ResultSetToObject<T>) cache.get(keys);
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if (resultSetToObject == null) {
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//System.out.printf("cache miss, keys: %s\n", keys);
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// generate and put into cache
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this.keys = keys.keys;
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cache.put(keys, this.resultSetToObject = genClass());
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this.keys = null;
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this._fields = null;
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this._fieldTypes = null;
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} else {
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//System.out.printf("cache hit, keys: %s\n", keys);
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// load from cache
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this.resultSetToObject = resultSetToObject;
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}
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} catch (SQLException e) {
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throw new MapperException("CachingRowToObjectMapper: SQLException: " + e.getMessage(), e);
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}
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}
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@Override
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public T mapRowToReturnType() {
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try {
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return resultSetToObject.toObject(_resultSet, _cal);
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} catch (SQLException e) {
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throw new MapperException(e.getMessage(), e);
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}
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}
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@Override
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protected String[] getKeysFromResultSet() throws SQLException {
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if (keys == null)
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throw new MapperException("not supported here");
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return keys;
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}
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@Override
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protected void getFieldMappings() throws SQLException {
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throw new MapperException("not supported here");
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}
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public interface ResultSetToObject<T> {
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T toObject(final ResultSet rs, final Calendar cal) throws SQLException;
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}
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protected String typeFromName(final Class<?> type) {
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return type.getName(); // todo: naive for now
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}
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protected String escapeJavaString(final String s) {
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// todo: escape key string, newlines, double quotes, backslashes...
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return s;
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}
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// code generation down here
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protected ResultSetToObject<T> genClass() {
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final String className = "CompilingMapper";
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final String tType = typeFromName(_returnTypeClass);
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final String header =
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"import static com.moparisthebest.jdbc.util.ResultSetUtil.*;\n\n" +
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"public final class " + className +
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" implements com.moparisthebest.jdbc.CompilingRowToObjectMapper.ResultSetToObject<" + tType + "> {\n" +
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" public " + tType + " toObject(final java.sql.ResultSet rs, final java.util.Calendar cal) throws java.sql.SQLException {\n";
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final String footer = " }\n" +
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"}\n";
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final StringBuilder java = new StringBuilder(header);
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//java.append("return null;\n");
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gen(java, tType);
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java.append(footer);
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//System.out.println(java);
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return compiler.compile(className, java);
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}
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protected void gen(final StringBuilder java, final String tType) {
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if (resultSetConstructor) {
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java.append("return new ").append(tType).append("(rs);\n");
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return;
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}
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if (returnMap) // we want a map
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try {
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// todo: does not call getMapImplementation, I think that's fine
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java.append("final Map<String, Object> ret = new ").append(tType).append("<String, Object>();\n");
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final ResultSetMetaData md = _resultSet.getMetaData();
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final int columnLength = _columnCount + 1;
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if (componentType != null && componentType != Object.class) { // we want a specific value type
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int typeId = _tmf.getTypeId(componentType);
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for (int x = 1; x < columnLength; ++x) {
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java.append("ret.put(").append(escapeJavaString(md.getColumnName(x).toLowerCase())).append(", ");
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extractColumnValueString(java, x, typeId);
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java.append(");\n");
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}
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} else // we want a generic object type
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for (int x = 1; x < columnLength; ++x)
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java.append("ret.put(").append(escapeJavaString(md.getColumnName(x).toLowerCase())).append(", rs.getObject(").append(x).append("));\n");
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java.append("return ret;\n");
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return;
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} catch (Throwable e) {
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throw new MapperException(e.getClass().getName() + " when trying to create a Map<String, "
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+ (componentType == null ? "java.lang.Object" : componentType.getName()) + "> from a ResultSet row" +
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", all columns must be of the map value type", e);
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}
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else if (componentType != null) // we want an array
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try {
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// todo: array initialization syntax?
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java.append("final ").append(tType).append("[] ret = new ").append(tType).append("[").append(_columnCount).append("];\n");
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final int typeId = _tmf.getTypeId(componentType);
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for (int x = 0; x < _columnCount; ) {
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java.append("ret[").append(x).append("] = ");
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extractColumnValueString(java, ++x, typeId);
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java.append(";\n");
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}
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java.append("return ret;\n");
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} catch (Throwable e) {
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throw new MapperException(e.getClass().getName() + " when trying to create a "
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+ componentType.getName() + "[] from a ResultSet row, all columns must be of that type", e);
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}
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// if the ResultSet only contains a single column we may be able to map directly
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// to the return type -- if so we don't need to build any structures to support
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// mapping
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if (_columnCount == 1) {
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final int typeId = _tmf.getTypeId(_returnTypeClass);
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try {
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if (typeId != TypeMappingsFactory.TYPE_UNKNOWN) {
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java.append("return ");
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extractColumnValueString(java, 1, typeId);
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java.append(";\n");
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return;
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} else {
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// we still might want a single value (i.e. java.util.Date)
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/*
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Object val = extractColumnValue(1, typeId);
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if (_returnTypeClass.isAssignableFrom(val.getClass())) {
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return _returnTypeClass.cast(val);
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}
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*/
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// we could actually pull from first row like above and test it first and fail now, but maybe just failing during compilation is enough?
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java.append("return (").append(tType).append(") ");
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extractColumnValueString(java, 1, typeId);
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java.append(";\n");
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return;
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}
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} catch (Exception e) {
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throw new MapperException(e.getMessage(), e);
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}
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}
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if (_fields == null) {
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try {
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super.getFieldMappings();
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} catch (SQLException e) {
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throw new MapperException(e.getMessage(), e);
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}
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}
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java.append("final ").append(tType).append(" ret = new ").append(tType).append("();\n");
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for (int i = 1; i < _fields.length; i++) {
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AccessibleObject f = _fields[i];
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//_args[0] = extractColumnValue(i, _fieldTypes[i]);
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//System.out.printf("field: '%s' obj: '%s' fieldType: '%s'\n", _fields[i], _args[0], _fieldTypes[i]);
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// custom hacked-in support for enums, can do better when we scrap org.apache.beehive.controls.system.jdbc.TypeMappingsFactory
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if (_fieldTypes[i] == 0) {
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final Class<?> fieldType = f instanceof Field ? ((Field) f).getType() : ((Method) f).getParameterTypes()[0];
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if (Enum.class.isAssignableFrom(fieldType)) {
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_args[0] = Enum.valueOf((Class<? extends Enum>) fieldType, (String) _args[0]);
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if (f instanceof Field) {
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// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
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java.append("ret.").append(((Field) f).getName()).append(" = ").append(typeFromName(fieldType)).append(".valueOf(");
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extractColumnValueString(java, i, _fieldTypes[i]);
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java.append(");\n");
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} else {
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java.append("ret.").append(((Method) f).getName()).append("(").append(typeFromName(fieldType)).append(".valueOf(");
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extractColumnValueString(java, i, _fieldTypes[i]);
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java.append("));\n");
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}
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}
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}
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if (f instanceof Field) {
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// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
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java.append("ret.").append(((Field) f).getName()).append(" = ");
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extractColumnValueString(java, i, _fieldTypes[i]);
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java.append(";\n");
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} else {
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java.append("ret.").append(((Method) f).getName()).append("(");
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extractColumnValueString(java, i, _fieldTypes[i]);
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java.append(");\n");
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}
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}
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// if this resultObject is Finishable, call finish()
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if (Finishable.class.isAssignableFrom(_returnTypeClass))
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java.append("ret.finish(rs);\n");
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java.append("return ret;\n");
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}
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/**
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* Extract a column value from the ResultSet and return it as resultType.
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*
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* @param index The column index of the value to extract from the ResultSet.
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* @param resultType The return type. Defined in TypeMappingsFactory.
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* @return The extracted value
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* @throws java.sql.SQLException on error.
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*/
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protected void extractColumnValueString(final StringBuilder java, final int index, final int resultType) {
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// todo: custom boolean
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switch (resultType) {
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case TypeMappingsFactory.TYPE_INT:
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java.append("rs.getInt(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_LONG:
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java.append("rs.getLong(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_FLOAT:
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java.append("rs.getFloat(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_DOUBLE:
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java.append("rs.getDouble(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BYTE:
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java.append("rs.getByte(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_SHORT:
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java.append("rs.getInt(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BOOLEAN:
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java.append("rs.getInt(").append(index).append(") ? Boolean.TRUE : Boolean.FALSE");
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return;
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case TypeMappingsFactory.TYPE_INT_OBJ:
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java.append("getObjectInt(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_LONG_OBJ:
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java.append("getObjectLong(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_FLOAT_OBJ:
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java.append("getObjectFloat(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_DOUBLE_OBJ:
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java.append("getObjectDouble(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BYTE_OBJ:
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java.append("getObjectByte(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_SHORT_OBJ:
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java.append("getObjectShort(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BOOLEAN_OBJ:
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java.append("getObjectBoolean(rs, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_STRING:
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case TypeMappingsFactory.TYPE_XMLBEAN_ENUM:
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java.append("rs.getString(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BIG_DECIMAL:
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java.append("rs.getBigDecimal(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BYTES:
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java.append("rs.getBytes(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_TIMESTAMP:
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java.append("getTimestamp(rs, cal, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_TIME:
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java.append("getTime(rs, cal, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_SQLDATE:
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java.append("getSqlDate(rs, cal, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_DATE:
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java.append("getUtilDate(rs, cal, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_CALENDAR:
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java.append("getCalendar(rs, cal, ").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_REF:
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java.append("rs.getRef(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_BLOB:
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java.append("rs.getBlob(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_CLOB:
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java.append("rs.getClob(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_ARRAY:
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java.append("rs.getArray(").append(index).append(")");
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return;
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case TypeMappingsFactory.TYPE_READER:
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case TypeMappingsFactory.TYPE_STREAM:
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throw new MapperException("streaming return types are not supported by the JdbcControl; use ResultSet instead");
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case TypeMappingsFactory.TYPE_STRUCT:
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case TypeMappingsFactory.TYPE_UNKNOWN:
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// JAVA_TYPE (could be any), or REF
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java.append("rs.getObject(").append(index).append(")");
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return;
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default:
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throw new MapperException("internal error: unknown type ID: " + Integer.toString(resultType));
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}
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}
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}
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@ -0,0 +1,88 @@
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package com.moparisthebest.jdbc.util;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.Time;
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import java.sql.Timestamp;
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import java.util.Calendar;
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/**
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* Created by mopar on 5/16/17.
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*/
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public class ResultSetUtil {
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public static Integer getObjectInt(final ResultSet rs, final int index) throws SQLException {
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final int ret = rs.getInt(index);
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return rs.wasNull() ? null : ret;
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}
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public static Long getObjectLong(final ResultSet rs, final int index) throws SQLException {
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final long ret = rs.getLong(index);
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return rs.wasNull() ? null : ret;
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}
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public static Float getObjectFloat(final ResultSet rs, final int index) throws SQLException {
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final float ret = rs.getFloat(index);
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return rs.wasNull() ? null : ret;
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}
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public static Double getObjectDouble(final ResultSet rs, final int index) throws SQLException {
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final double ret = rs.getDouble(index);
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return rs.wasNull() ? null : ret;
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}
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public static Byte getObjectByte(final ResultSet rs, final int index) throws SQLException {
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final byte ret = rs.getByte(index);
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return rs.wasNull() ? null : ret;
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}
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public static Short getObjectShort(final ResultSet rs, final int index) throws SQLException {
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final short ret = rs.getShort(index);
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return rs.wasNull() ? null : ret;
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}
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public static Boolean getObjectBoolean(final ResultSet rs, final int index) throws SQLException {
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final boolean ret = rs.getBoolean(index);
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return rs.wasNull() ? null : (ret ? Boolean.TRUE : Boolean.FALSE);
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}
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public static Timestamp getTimestamp(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
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if (null == _cal)
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return _resultSet.getTimestamp(index);
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else
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return _resultSet.getTimestamp(index, _cal);
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}
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public static Time getTime(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
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if (null == _cal)
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return _resultSet.getTime(index);
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else
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return _resultSet.getTime(index, _cal);
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}
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public static java.sql.Date getSqlDate(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
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if (null == _cal)
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return _resultSet.getDate(index);
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else
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return _resultSet.getDate(index, _cal);
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}
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public static java.util.Date getUtilDate(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
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||||
// convert explicity to java.util.Date
|
||||
// 12918 | knex does not return java.sql.Date properly from web service
|
||||
java.sql.Timestamp ts = (null == _cal) ? _resultSet.getTimestamp(index) : _resultSet.getTimestamp(index, _cal);
|
||||
if (null == ts)
|
||||
return null;
|
||||
return new java.util.Date(ts.getTime());
|
||||
}
|
||||
|
||||
public static Calendar getCalendar(final ResultSet _resultSet, final Calendar _cal, final int index) throws SQLException {
|
||||
java.sql.Timestamp ts = (null == _cal) ? _resultSet.getTimestamp(index) : _resultSet.getTimestamp(index, _cal);
|
||||
if (null == ts)
|
||||
return null;
|
||||
Calendar c = (null == _cal) ? Calendar.getInstance() : (Calendar) _cal.clone();
|
||||
c.setTimeInMillis(ts.getTime());
|
||||
return c;
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user