332 lines
15 KiB
Java
332 lines
15 KiB
Java
package com.moparisthebest.jdbc.codegen;
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import com.moparisthebest.jdbc.Finishable;
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import com.moparisthebest.jdbc.ResultSetMapper;
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import com.moparisthebest.jdbc.util.ResultSetIterable;
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import javax.annotation.processing.ProcessingEnvironment;
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import javax.lang.model.SourceVersion;
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import javax.lang.model.element.ExecutableElement;
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import javax.lang.model.element.Modifier;
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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 javax.lang.model.util.Elements;
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import javax.lang.model.util.Types;
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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.util.*;
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import static com.moparisthebest.jdbc.codegen.JdbcMapperProcessor.typeMirrorStringNoGenerics;
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import static com.moparisthebest.jdbc.codegen.JdbcMapperProcessor.typeMirrorToClass;
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/**
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* Created by mopar on 5/26/17.
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*/
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public class CompileTimeResultSetMapper {
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public static final SourceVersion RELEASE_8;
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static {
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SourceVersion rl8 = null;
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try {
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rl8 = SourceVersion.valueOf("RELEASE_8");
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} catch(Throwable e) {
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// ignore
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}
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RELEASE_8 = rl8;
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}
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public final Types types;
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public final TypeMirror collectionType, mapType, mapCollectionType, iteratorType, listIteratorType, finishableType, resultSetType, resultSetIterableType;
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private final boolean java8;
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public CompileTimeResultSetMapper(final ProcessingEnvironment processingEnv) {
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types = processingEnv.getTypeUtils();
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final Elements elements = processingEnv.getElementUtils();
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// is this the proper way to do this?
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java8 = RELEASE_8 != null && processingEnv.getSourceVersion().ordinal() >= RELEASE_8.ordinal();
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collectionType = types.getDeclaredType(elements.getTypeElement(Collection.class.getCanonicalName()), types.getWildcardType(null, null));
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mapType = types.getDeclaredType(elements.getTypeElement(Map.class.getCanonicalName()), types.getWildcardType(null, null), types.getWildcardType(null, null));
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mapCollectionType = types.getDeclaredType(elements.getTypeElement(Map.class.getCanonicalName()), types.getWildcardType(null, null), types.getWildcardType(collectionType, null));
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iteratorType = types.getDeclaredType(elements.getTypeElement(Iterator.class.getCanonicalName()), types.getWildcardType(null, null));
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listIteratorType = types.getDeclaredType(elements.getTypeElement(ListIterator.class.getCanonicalName()), types.getWildcardType(null, null));
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finishableType = elements.getTypeElement(Finishable.class.getCanonicalName()).asType();
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resultSetType = elements.getTypeElement(ResultSet.class.getCanonicalName()).asType();
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resultSetIterableType = types.getDeclaredType(elements.getTypeElement(ResultSetIterable.class.getCanonicalName()), types.getWildcardType(null, null));
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}
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public static String getConcreteClassCanonicalName(final TypeMirror returnType, final Class defaultConcreteClass) {
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final Set<Modifier> modifiers = ((DeclaredType) returnType).asElement().getModifiers();
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if (modifiers.contains(Modifier.ABSTRACT)) { // todo: no interface?
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try {
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final Class concrete = ResultSetMapper.interfaceToConcrete.get(typeMirrorToClass(returnType));
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return (concrete == null ? defaultConcreteClass : concrete).getCanonicalName();
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} catch (ClassNotFoundException e) {
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// ignore?
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}
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}
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return typeMirrorStringNoGenerics(returnType);
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}
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/**
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*
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* @return true if calling code should close rs (ResultSet) and ps (PreparedStatement) if closePs is false, false otherwise
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*/
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public boolean mapToResultType(final Writer w, final String[] keys, final ExecutableElement eeMethod, final MaxRows maxRows, final String cal, final String cleaner, final boolean closePs) throws IOException, NoSuchMethodException, ClassNotFoundException {
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//final Method m = fromExecutableElement(eeMethod);
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//final Class returnType = m.getReturnType();
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final TypeMirror returnTypeMirror = eeMethod.getReturnType();
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//final Class returnType = typeMirrorToClass(returnTypeMirror);
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if (returnTypeMirror.getKind() == TypeKind.ARRAY) {
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final TypeMirror componentType = ((ArrayType) returnTypeMirror).getComponentType();
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toArray(w, keys, componentType, maxRows, cal, cleaner);
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} else if (types.isAssignable(returnTypeMirror, collectionType)) {
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final List<? extends TypeMirror> typeArguments = ((DeclaredType) returnTypeMirror).getTypeArguments();
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toCollection(w, keys, returnTypeMirror, typeArguments.get(0), maxRows, cal, cleaner);
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} else if (types.isAssignable(returnTypeMirror, mapType)) {
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final List<? extends TypeMirror> typeArguments = ((DeclaredType) returnTypeMirror).getTypeArguments();
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//if (types[1] instanceof ParameterizedType) { // for collectionMaps
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if (types.isAssignable(returnTypeMirror, mapCollectionType)) { // for collectionMaps
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final TypeMirror collectionTypeMirror = typeArguments.get(1);
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final TypeMirror componentTypeMirror = ((DeclaredType) collectionTypeMirror).getTypeArguments().get(0);
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toMapCollection(w, keys,
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returnTypeMirror,
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typeArguments.get(0),
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collectionTypeMirror,
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componentTypeMirror,
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maxRows, cal, cleaner);
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return true;
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}
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toMap(w, keys, returnTypeMirror, typeArguments.get(0), typeArguments.get(1), maxRows, cal, cleaner);
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} else if (types.isAssignable(returnTypeMirror, iteratorType)) {
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final List<? extends TypeMirror> typeArguments = ((DeclaredType) returnTypeMirror).getTypeArguments();
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if (types.isAssignable(returnTypeMirror, resultSetIterableType)) {
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toResultSetIterable(w, keys, typeArguments.get(0), cal, cleaner, closePs);
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return false;
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} else if (types.isAssignable(returnTypeMirror, listIteratorType))
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toListIterator(w, keys, typeArguments.get(0), maxRows, cal, cleaner);
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else
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toIterator(w, keys, typeArguments.get(0), maxRows, cal, cleaner);
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} else {
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toObject(w, keys, returnTypeMirror, cal, cleaner);
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}
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return true;
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}
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public CompileTimeRowToObjectMapper getRowMapper(final String[] keys, TypeMirror returnTypeClass, String cal, TypeMirror mapValType, TypeMirror mapKeyType) {
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return getRowMapper(keys, returnTypeClass, "rs", cal, mapValType, mapKeyType);
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}
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public CompileTimeRowToObjectMapper getRowMapper(final String[] keys, TypeMirror returnTypeClass, final String resultSetName, String cal, TypeMirror mapValType, TypeMirror mapKeyType) {
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return new CompileTimeRowToObjectMapper(this, keys, returnTypeClass, resultSetName, cal, mapValType, mapKeyType);
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}
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public void writeObject(final Writer w, final String[] keys, final TypeMirror returnTypeMirror, final String cal) throws IOException, ClassNotFoundException {
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writeObject(w, keys, returnTypeMirror, "rs", cal);
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}
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public void writeObject(final Writer w, final String[] keys, final TypeMirror returnTypeMirror, final String resultSetName, final String cal) throws IOException, ClassNotFoundException {
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getRowMapper(keys, returnTypeMirror, resultSetName, cal, null, null).gen(w, returnTypeMirror.toString());
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}
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public void toObject(final Writer w, final String[] keys, final TypeMirror returnTypeMirror, final String cal, final String cleaner) throws IOException, ClassNotFoundException {
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w.write("\t\t\tif(rs.next()) {\n");
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writeObject(w, keys, returnTypeMirror, cal);
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w.write("\t\t\t\treturn ");
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// this does not clean null on purpose, neither does CleaningResultSetMapper
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clean(w, cleaner).write(";\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n");
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}
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private void toResultSetIterable(final Writer w, final String[] keys, final TypeMirror returnTypeMirror, final String cal, final String cleaner, final boolean closePs) throws IOException, ClassNotFoundException {
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w.write("\t\t\treturn com.moparisthebest.jdbc.util.ResultSetIterable.getResultSetIterable(rs,\n\t\t\t\t\trs.next() ? ");
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if(java8) {
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w.append("(_rs, _cal) -> {\n");
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} else {
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final String returnTypeString = returnTypeMirror.toString();
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w.append("new com.moparisthebest.jdbc.util.ResultSetToObject<")
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.append(returnTypeString).append(">() {\n\t\t\t\t\tpublic ")
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.append(returnTypeString).append(" toObject(final ResultSet _rs, final java.util.Calendar _cal) throws SQLException {\n");
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}
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// com.moparisthebest.jdbc.util.ResultSetToObject implementation
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writeObject(w, keys, returnTypeMirror, "_rs", cal == null ? null : "_cal");
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w.write("\t\t\t\t\t\treturn ");
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clean(w, cleaner).write(";\n");
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// end ResultSetToObject implementation
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if(!java8)
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w.write("\t\t\t\t\t}\n");
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w.append("\t\t\t\t\t}\n\t\t\t\t: null, ").append(cal == null ? "null" : cal).append(")");
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if(closePs)
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w.append(".setPreparedStatementToClose(ps)");
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w.append(";\n");
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}
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public void writeCollection(final Writer w, final String[] keys, final String returnTypeString, final String concreteTypeString, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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maxRowInit(w, maxRows).write("\t\t\tfinal ");
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w.write(returnTypeString);
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w.write(" _colret = new ");
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w.write(concreteTypeString);
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w.write(returnTypeString.substring(returnTypeString.indexOf('<')));
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w.write("();\n\t\t\twhile(rs.next()) {\n");
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writeObject(w, keys, componentTypeMirror, cal);
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w.write("\t\t\t\t_colret.add(");
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clean(w, cleaner).write(");\n");
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maxRowBreak(w, maxRows).write("\t\t\t}\n");
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}
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public void toCollection(final Writer w, final String[] keys, final TypeMirror collectionTypeMirror, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String collectionType = getConcreteClassCanonicalName(collectionTypeMirror, ArrayList.class);
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writeCollection(w, keys, collectionTypeMirror.toString(), collectionType, componentTypeMirror, maxRows, cal, cleaner);
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w.write("\t\t\treturn _colret;\n");
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}
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public void toArray(final Writer w, final String[] keys, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String returnTypeString = componentTypeMirror.toString();
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writeCollection(w, keys, "java.util.List<" + returnTypeString + ">", "java.util.ArrayList", componentTypeMirror, maxRows, cal, cleaner);
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w.write("\t\t\treturn _colret.toArray(new ");
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w.write(returnTypeString);
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w.write("[_colret.size()]);\n");
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}
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public void toListIterator(final Writer w, final String[] keys, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String returnTypeString = componentTypeMirror.toString();
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writeCollection(w, keys, "java.util.List<" + returnTypeString + ">", "java.util.ArrayList", componentTypeMirror, maxRows, cal, cleaner);
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w.write("\t\t\treturn _colret.listIterator();\n");
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}
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public void toIterator(final Writer w, final String[] keys, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String returnTypeString = componentTypeMirror.toString();
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writeCollection(w, keys, "java.util.List<" + returnTypeString + ">", "java.util.ArrayList", componentTypeMirror, maxRows, cal, cleaner);
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w.write("\t\t\treturn _colret.iterator();\n");
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}
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public void toMap(final Writer w, final String[] keys, final TypeMirror mapTypeMirror, final TypeMirror mapKeyTypeMirror, final TypeMirror componentTypeMirror, MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String mapType = getConcreteClassCanonicalName(mapTypeMirror, HashMap.class);
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final String returnTypeString = mapTypeMirror.toString();
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maxRowInit(w, maxRows).write("\t\t\tfinal ");
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w.write(returnTypeString);
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w.write(" _colret = new ");
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w.write(mapType);
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w.write(returnTypeString.substring(returnTypeString.indexOf('<')));
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w.write("();\n\t\t\twhile(rs.next()) {\n");
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//writeObject(w, keys, componentTypeMirror, componentType, cal);
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final CompileTimeRowToObjectMapper rm = getRowMapper(keys, componentTypeMirror, cal, null, mapKeyTypeMirror);
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rm.gen(w, componentTypeMirror.toString());
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w.write("\t\t\t\t_colret.put(");
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rm.extractColumnValueString(w, 1, mapKeyTypeMirror);
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w.write(", ");
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clean(w, cleaner).write(");\n");
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maxRowBreak(w, maxRows).write("\t\t\t}\n");
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w.write("\t\t\treturn _colret;\n");
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}
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public void toMapCollection(final Writer w, final String[] keys,
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final TypeMirror mapTypeMirror,
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final TypeMirror mapKeyTypeMirror,
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final TypeMirror collectionTypeMirror,
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final TypeMirror componentTypeMirror,
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MaxRows maxRows, String cal, final String cleaner) throws IOException, ClassNotFoundException {
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final String mapType = getConcreteClassCanonicalName(mapTypeMirror, HashMap.class);
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final String collectionType = getConcreteClassCanonicalName(collectionTypeMirror, ArrayList.class);
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final String returnTypeString = mapTypeMirror.toString();
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final String collectionTypeString = collectionTypeMirror.toString();
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maxRowInit(w, maxRows).write("\t\t\tfinal ");
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w.write(returnTypeString);
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w.write(" _colret = new ");
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w.write(mapType);
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w.write(returnTypeString.substring(returnTypeString.indexOf('<')));
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w.write("();\n\t\t\twhile(rs.next()) {\n");
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//writeObject(w, keys, componentTypeMirror, componentType, cal);
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final CompileTimeRowToObjectMapper rm = getRowMapper(keys, componentTypeMirror, cal, null, mapKeyTypeMirror);
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rm.gen(w, componentTypeMirror.toString());
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w.write("\t\t\t\tfinal ");
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w.write(mapKeyTypeMirror.toString());
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w.write(" _colkey = ");
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rm.extractColumnValueString(w, 1, mapKeyTypeMirror);
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w.write(";\n\t\t\t\t");
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w.write(collectionTypeString);
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w.write(" _collist = _colret.get(_colkey);\n\t\t\t\tif(_collist == null) {\n\t\t\t\t\t_collist = new ");
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w.write(collectionType);
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w.write(collectionTypeString.substring(collectionTypeString.indexOf('<')));
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w.write("();\n\t\t\t\t\t_colret.put(_colkey, _collist);\n\t\t\t\t}\n\t\t\t\t_collist.add(");
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clean(w, cleaner).write(");\n");
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maxRowBreak(w, maxRows).write("\t\t\t}\n\t\t\treturn _colret;\n");
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}
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private Writer maxRowInit(final Writer w, final MaxRows maxRows) throws IOException {
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if(maxRows != null)
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w.append("\t\t\t").append(maxRows.type).append(" _rowCount = 0;\n");
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return w;
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}
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private Writer maxRowBreak(final Writer w, final MaxRows maxRows) throws IOException {
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if(maxRows != null) {
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w.append("\t\t\t\tif(");
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if(maxRows.dynamic)
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w.append(maxRows.value).append(" > 0 && ");
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w.append("++_rowCount == ").append(maxRows.value).append(")\n\t\t\t\t\tbreak;\n");
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}
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return w;
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}
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private Writer clean(final Writer w, final String cleaner) throws IOException {
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if(cleaner == null)
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w.write("ret");
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else {
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w.append(cleaner).append(".clean(ret)");
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}
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return w;
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}
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static class MaxRows {
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final String value, type;
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final boolean dynamic;
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static MaxRows getMaxRows(final long value) {
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return value < 1 ? null : new MaxRows(value);
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}
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static MaxRows getMaxRows(final String value, final String type) {
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return new MaxRows(value, type);
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}
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private MaxRows(final long value) {
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String valueString = Long.toString(value);
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this.dynamic = false;
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if(value <= Byte.MAX_VALUE)
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this.type = "byte";
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else if(value <= Short.MAX_VALUE)
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this.type = "short";
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else if(value <= Integer.MAX_VALUE)
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this.type = "int";
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else {
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this.type = "long";
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valueString += "L"; // fun!
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}
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this.value = valueString;
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}
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private MaxRows(final String value, final String type) {
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this.value = value;
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this.type = type;
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this.dynamic = true;
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}
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}
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}
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