Migrate JdbcMapperProcessor away from using reflection and Class objects all together...
parent
a1ad929cf4
commit
783b51b810
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package com.moparisthebest.jdbc.codegen;
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import com.moparisthebest.jdbc.CompilingRowToObjectMapper;
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import com.moparisthebest.jdbc.Finishable;
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import com.moparisthebest.jdbc.MapperException;
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import com.moparisthebest.jdbc.TypeMappingsFactory;
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import javax.lang.model.element.*;
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import javax.lang.model.type.ArrayType;
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import javax.lang.model.type.DeclaredType;
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import javax.lang.model.type.TypeKind;
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import javax.lang.model.type.TypeMirror;
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import java.io.IOException;
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import java.io.Writer;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.util.*;
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import java.util.regex.Matcher;
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import static com.moparisthebest.jdbc.CompilingRowToObjectMapper.escapeMapKeyString;
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import static com.moparisthebest.jdbc.RowToObjectMapper._setterRegex;
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import static com.moparisthebest.jdbc.codegen.JdbcMapperProcessor.typeMirrorToClass;
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/**
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* Created by mopar on 6/7/17.
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*/
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public class CompileTimeRowToObjectMapper {
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protected static final TypeMappingsFactory _tmf = TypeMappingsFactory.getInstance();
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final String[] keys;
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/**
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* Calendar instance for date/time mappings.
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*/
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protected final Calendar _cal;
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/**
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* Class to map ResultSet Rows to.
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*/
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protected final TypeMirror _returnTypeClass;
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protected final TypeMirror _mapKeyType;
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protected final int _columnCount;
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protected final boolean mapOnlySecondColumn;
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// only non-null when _returnTypeClass is an array, or a map
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protected final TypeMirror componentType;
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protected final boolean returnMap, resultSetConstructor;
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protected Element[] _fields = null;
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protected int[] _fieldTypes;
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public CompileTimeRowToObjectMapper(final String[] keys, final TypeMirror returnTypeClass, final Calendar cal, final TypeMirror mapValType, final TypeMirror mapKeyType) {
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this.keys = keys;
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_cal = cal;
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_mapKeyType = mapKeyType;
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_columnCount = keys.length - 1;
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mapOnlySecondColumn = _mapKeyType != null && _columnCount == 2;
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returnMap = false;//todo: Map.class.isAssignableFrom(returnTypeClass);
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if (returnMap) {
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// todo: need this? _returnTypeClass = ResultSetMapper.getConcreteClass(returnTypeClass, HashMap.class);
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_returnTypeClass = null;
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componentType = mapValType;
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resultSetConstructor = false;
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} else {
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_returnTypeClass = returnTypeClass;
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// detect if we want an array back
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componentType = returnTypeClass.getKind() == TypeKind.ARRAY ? ((ArrayType) returnTypeClass).getComponentType() : null;
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// detect if returnTypeClass has a constructor that takes a ResultSet, if so, our job couldn't be easier...
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boolean resultSetConstructor = false, defaultConstructor = false;
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if(_returnTypeClass.getKind() == TypeKind.DECLARED) {
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final List<? extends Element> methodsAndConstructors = ((TypeElement)((DeclaredType)_returnTypeClass).asElement()).getEnclosedElements();
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for(final Element e : methodsAndConstructors) {
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if(e.getKind() == ElementKind.CONSTRUCTOR) {
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final List<? extends VariableElement> params = ((ExecutableElement)e).getParameters();
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if(params.isEmpty())
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defaultConstructor = true;
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else if(params.size() == 1 && params.get(0).asType().toString().equals("java.sql.ResultSet")) // todo: this better
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resultSetConstructor = true;
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}
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}
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}
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this.resultSetConstructor = resultSetConstructor;
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if(!resultSetConstructor && !defaultConstructor && _columnCount > 2 && componentType == null)
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throw new RuntimeException("Exception when trying to get constructor for : "+_returnTypeClass.toString() + " Must have default no-arg constructor or one that takes a single ResultSet.");
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}
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}
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/**
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* Build the structures necessary to do the mapping
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*
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* @throws SQLException on error.
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*/
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protected void getFieldMappings() {
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if(_returnTypeClass.getKind() != TypeKind.DECLARED)
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throw new RuntimeException("_returnTypeClass " + _returnTypeClass + " not TypeKind.DECLARED ?? how??");
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final DeclaredType declaredReturnType = (DeclaredType)_returnTypeClass;
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// added this to handle stripping '_' from keys
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Map<String, String> strippedKeys = new HashMap<String, String>();
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for (final String key : keys) {
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String strippedKey = key;
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if (key != null) {
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strippedKey = key.replaceAll("_", "");
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if (key.equals(strippedKey))
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continue;
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strippedKeys.put(strippedKey, key);
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}
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}
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//System.out.println("strippedKeys: "+strippedKeys);
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//
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// find fields or setters for return class
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//
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HashMap<String, Element> mapFields = new HashMap<String, Element>(_columnCount * 2);
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for (int i = 1; i <= _columnCount; i++) {
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mapFields.put(keys[i], null);
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}
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// public methods todo: does this do super methods too?
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for (Element e : ((TypeElement)declaredReturnType.asElement()).getEnclosedElements()) {
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if(e.getKind() != ElementKind.METHOD)
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continue;
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final ExecutableElement m = (ExecutableElement)e;
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//System.out.printf("method: '%s', isSetterMethod: '%s'\n", m, isSetterMethod(m));
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if (isSetterMethod(m)) {
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String fieldName = m.getSimpleName().toString().substring(3).toUpperCase();
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//System.out.println("METHOD-fieldName1: "+fieldName);
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if (!mapFields.containsKey(fieldName)) {
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fieldName = strippedKeys.get(fieldName);
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if (fieldName == null)
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continue;
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//System.out.println("METHOD-fieldName2: "+fieldName);
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}
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final Element field = mapFields.get(fieldName);
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// check for overloads
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if (field == null) {
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mapFields.put(fieldName, m);
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} else {
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// todo: does this work?
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// fix for 'overloaded' methods when it comes to stripped keys, we want the exact match
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final String thisName = m.getSimpleName().toString().substring(3).toUpperCase();
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final String previousName = field.getSimpleName().toString().substring(3).toUpperCase();
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//System.out.printf("thisName: '%s', previousName: '%s', mapFields.containsKey(thisName): %b, strippedKeys.containsKey(previousName): %b\n", thisName, previousName, mapFields.containsKey(thisName), strippedKeys.containsKey(previousName));
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if(mapFields.containsKey(thisName) && strippedKeys.containsKey(previousName)) {
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mapFields.put(fieldName, m);
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} else if (!mapFields.containsKey(previousName) || !strippedKeys.containsKey(thisName)) {
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throw new MapperException("Unable to choose between overloaded methods '" + m.getSimpleName().toString()
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+ "' and '" + field.getSimpleName().toString() + "' for field '" + fieldName + "' on the '" + _returnTypeClass.toString() + "' class. Mapping is done using "
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+ "a case insensitive comparison of SQL ResultSet columns to field "
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+ "names and public setter methods on the return class. Columns are also "
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+ "stripped of '_' and compared if no match is found with them.");
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}
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// then the 'overloaded' method is already correct
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}
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}
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}
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// fix for 8813: include inherited and non-public fields
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for (DeclaredType clazz = declaredReturnType; clazz != null && !clazz.toString().equals("java.lang.Object");
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clazz = clazz.getEnclosingType().getKind() == TypeKind.DECLARED ? (DeclaredType)clazz.getEnclosingType() : null
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) {
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//System.out.println("fields in class: "+Arrays.toString(classFields));
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for (Element e : ((TypeElement)clazz.asElement()).getEnclosedElements()) {
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if(e.getKind() != ElementKind.FIELD)
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continue;
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final VariableElement f = (VariableElement)e;
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//System.out.println("f.fieldName: "+f.getSimpleName());
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if (f.getModifiers().contains(Modifier.STATIC)) continue;
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if (!f.getModifiers().contains(Modifier.PUBLIC)) continue;
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String fieldName = f.getSimpleName().toString().toUpperCase();
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//System.out.println("fieldName: "+fieldName);
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if (!mapFields.containsKey(fieldName)) {
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fieldName = strippedKeys.get(fieldName);
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if (fieldName == null)
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continue;
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}
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final Element field = mapFields.get(fieldName);
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if (field == null) {
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mapFields.put(fieldName, f);
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} else if(field.getKind() == ElementKind.FIELD) {
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// fix for 'overloaded' fields when it comes to stripped keys, we want the exact match
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final String thisName = f.getSimpleName().toString().toUpperCase();
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final String previousName = field.getSimpleName().toString().toUpperCase();
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//System.out.printf("thisName: '%s', previousName: '%s', mapFields.containsKey(thisName): %b, strippedKeys.containsKey(previousName): %b\n", thisName, previousName, mapFields.containsKey(thisName), strippedKeys.containsKey(previousName));
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if(mapFields.containsKey(thisName) && strippedKeys.containsKey(previousName)) {
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mapFields.put(fieldName, f);
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} else if (!mapFields.containsKey(previousName) || !strippedKeys.containsKey(thisName)) {
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throw new MapperException("Unable to choose between overloaded fields '" + f.getSimpleName().toString()
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+ "' and '" + field.getSimpleName().toString() + "' for field '" + fieldName + "' on the '" + _returnTypeClass.toString() + "' class. Mapping is done using "
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+ "a case insensitive comparison of SQL ResultSet columns to field "
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+ "names and public setter methods on the return class. Columns are also "
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+ "stripped of '_' and compared if no match is found with them.");
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}
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// then the 'overloaded' field is already correct
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}
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}
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}
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// finally actually init the fields array
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_fields = new Element[_columnCount + 1];
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_fieldTypes = new int[_columnCount + 1];
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for (int i = 1; i < _fields.length; i++) {
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Element f = mapFields.get(keys[i]);
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if (f == null) {
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throw new MapperException("Unable to map the SQL column '" + keys[i]
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+ "' to a field on the '" + _returnTypeClass.toString() +
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"' class. Mapping is done using a case insensitive comparison of SQL ResultSet "
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+ "columns to field "
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+ "names and public setter methods on the return class. Columns are also "
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+ "stripped of '_' and compared if no match is found with them.");
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}
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_fields[i] = f;
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if (f.getKind() == ElementKind.FIELD) {
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_fieldTypes[i] = getTypeId(((VariableElement) f).asType());
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} else {
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_fieldTypes[i] = getTypeId(((ExecutableElement) f).getParameters().get(0).asType());
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}
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}
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}
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/**
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* Determine if the given method is a java bean setter method.
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* @param method Method to check
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* @return True if the method is a setter method.
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*/
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protected boolean isSetterMethod(final ExecutableElement method) {
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Matcher matcher = _setterRegex.matcher(method.getSimpleName());
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if (matcher.matches()) {
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final Set<Modifier> modifiers = method.getModifiers();
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if (modifiers.contains(Modifier.STATIC)) return false;
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if (!modifiers.contains(Modifier.PUBLIC)) return false;
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if (TypeKind.VOID != method.getReturnType().getKind()) return false;
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// method parameter checks
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final List<? extends VariableElement> params = method.getParameters();
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if (params.size() != 1) return false;
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if (TypeMappingsFactory.TYPE_UNKNOWN == getTypeId(params.get(0).asType())) return false;
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return true;
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}
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return false;
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}
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public void gen(final Appendable java, final String tType) throws IOException, ClassNotFoundException {
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if(mapOnlySecondColumn){
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java.append("final ").append(tType).append(" ret = ");
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extractColumnValueString(java, 2, _returnTypeClass);
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java.append(";\n");
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return;
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}
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if (resultSetConstructor) {
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java.append("final ").append(tType).append(" ret = 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 ").append(tType).append("<String, Object> ret = new ").append(tType).append("<String, Object>();\n");
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final int columnLength = _columnCount + 1;
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int typeId = getTypeId(componentType);
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if (componentType != null && typeId != TypeMappingsFactory.TYPE_UNKNOWN) { // we want a specific value type
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for (int x = 1; x < columnLength; ++x) {
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java.append("ret.put(").append(escapeMapKeyString(keys[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(escapeMapKeyString(keys[x].toLowerCase())).append(", rs.getObject(").append(String.valueOf(x)).append("));\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.toString()) + "> 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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java.append("final ").append(tType).append(" ret = new ").append(tType.substring(0, tType.length() - 1)).append(String.valueOf(_columnCount)).append("];\n");
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final int typeId = getTypeId(componentType);
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for (int x = 0; x < _columnCount; ) {
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java.append("ret[").append(String.valueOf(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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return;
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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 + "[] 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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try {
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final int typeId = getTypeId(_returnTypeClass);
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if (typeId != TypeMappingsFactory.TYPE_UNKNOWN) {
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java.append("final ").append(tType).append(" ret = ");
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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("final ").append(tType).append(" ret = (").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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getFieldMappings();
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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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final Element f = _fields[i];
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final boolean isField = f.getKind() == ElementKind.FIELD;
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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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/*
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final Class<?> fieldType = isField ? ((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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// no for now...
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}
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if (isField) {
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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(f.getSimpleName().toString()).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(f.getSimpleName().toString()).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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//todo: java.append("ret.finish(rs);\n");
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}
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public static int getTypeId(TypeMirror classType) {
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try {
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return _tmf.getTypeId(typeMirrorToClass(classType));
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} catch (ClassNotFoundException e) {
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return TypeMappingsFactory.TYPE_UNKNOWN;
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}
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}
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public static void extractColumnValueString(final Appendable java, final int index, final int resultType) throws IOException, ClassNotFoundException {
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CompilingRowToObjectMapper.extractColumnValueString(java, index, resultType);
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}
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public static void extractColumnValueString(final Appendable java, final int index, final TypeMirror resultType) throws IOException, ClassNotFoundException {
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CompilingRowToObjectMapper.extractColumnValueString(java, index, typeMirrorToClass(resultType));
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}
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}
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