com.querydsl.codegen.utils.ECJEvaluatorFactory Maven / Gradle / Ivy
/*
* Copyright 2010, Mysema Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.querydsl.codegen.utils;
import com.querydsl.codegen.utils.model.ClassType;
import com.querydsl.codegen.utils.model.Type;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.StringTokenizer;
import java.util.stream.Collectors;
import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
import org.eclipse.jdt.core.compiler.CategorizedProblem;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.*;
import org.eclipse.jdt.internal.compiler.Compiler;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader;
import org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException;
import org.eclipse.jdt.internal.compiler.env.ICompilationUnit;
import org.eclipse.jdt.internal.compiler.env.INameEnvironment;
import org.eclipse.jdt.internal.compiler.env.NameEnvironmentAnswer;
import org.eclipse.jdt.internal.compiler.impl.CompilerOptions;
import org.eclipse.jdt.internal.compiler.problem.DefaultProblemFactory;
import org.eclipse.jdt.internal.compiler.tool.EclipseFileManager;
/**
* EvaluatorFactory is a factory implementation for creating Evaluator instances
*
* @author tiwe
*/
public class ECJEvaluatorFactory extends AbstractEvaluatorFactory {
private final MemFileManager fileManager;
private final ClassLoader parentClassLoader;
private final List problemList = new ArrayList<>();
private final CompilerOptions compilerOptions;
public static CompilerOptions getDefaultCompilerOptions() {
String javaSpecVersion = System.getProperty("java.specification.version");
Map settings = new HashMap<>();
settings.put(CompilerOptions.OPTION_Source, javaSpecVersion);
settings.put(CompilerOptions.OPTION_TargetPlatform, javaSpecVersion);
settings.put(CompilerOptions.OPTION_ReportDeprecation, CompilerOptions.IGNORE);
return new CompilerOptions(settings);
}
public ECJEvaluatorFactory(ClassLoader parent) {
this(parent, getDefaultCompilerOptions());
}
public ECJEvaluatorFactory(ClassLoader parent, CompilerOptions compilerOptions) {
this.parentClassLoader = parent;
this.fileManager =
new MemFileManager(
parent, new EclipseFileManager(Locale.getDefault(), Charset.defaultCharset()));
this.loader = fileManager.getClassLoader(StandardLocation.CLASS_OUTPUT);
this.compilerOptions = compilerOptions;
}
protected void compile(
String source,
ClassType projectionType,
String[] names,
Type[] types,
String id,
Map constants)
throws IOException {
// create source
source = createSource(source, projectionType, names, types, id, constants);
// compile
final char[] targetContents = source.toCharArray();
final String targetName = id;
final ICompilationUnit[] targetCompilationUnits =
new ICompilationUnit[] {
new ICompilationUnit() {
@Override
public char[] getContents() {
return targetContents;
}
@Override
public char[] getMainTypeName() {
int dot = targetName.lastIndexOf('.');
if (dot > 0) {
return targetName.substring(dot + 1).toCharArray();
} else {
return targetName.toCharArray();
}
}
@Override
public char[][] getPackageName() {
StringTokenizer tok = new StringTokenizer(targetName, ".");
char[][] result = new char[tok.countTokens() - 1][];
for (int j = 0; j < result.length; j++) {
result[j] = tok.nextToken().toCharArray();
}
return result;
}
@Override
public char[] getFileName() {
return CharOperation.concat(targetName.toCharArray(), ".java".toCharArray());
}
@Override
public boolean ignoreOptionalProblems() {
return true;
}
}
};
INameEnvironment env =
new INameEnvironment() {
private String join(char[][] compoundName, char separator) {
if (compoundName == null) {
return "";
} else {
List parts = new ArrayList<>(compoundName.length);
for (char[] part : compoundName) {
parts.add(new String(part));
}
return parts.stream().collect(Collectors.joining(new String(new char[] {separator})));
}
}
@Override
public NameEnvironmentAnswer findType(char[][] compoundTypeName) {
return findType(join(compoundTypeName, '.'));
}
@Override
public NameEnvironmentAnswer findType(char[] typeName, char[][] packageName) {
return findType(CharOperation.arrayConcat(packageName, typeName));
}
private boolean isClass(String result) {
if (result == null || result.isEmpty()) {
return false;
}
// if it's the class we're compiling, then of course it's a class
if (result.equals(targetName)) {
return true;
}
InputStream is = null;
try {
// if this is a class we've already compiled, it's a class
is = loader.getResourceAsStream(result);
if (is == null) {
// use our normal class loader now...
String resourceName = result.replace('.', '/') + ".class";
is = parentClassLoader.getResourceAsStream(resourceName);
if (is == null && !result.contains(".")) {
// we couldn't find the class, and it has no package; is it a core class?
is = parentClassLoader.getResourceAsStream("java/lang/" + resourceName);
}
}
return is != null;
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ex) {
}
}
}
}
@Override
public boolean isPackage(char[][] parentPackageName, char[] packageName) {
// if the parent is a class, the child can't be a package
String parent = join(parentPackageName, '.');
if (isClass(parent)) {
return false;
}
// if the child is a class, it's not a package
String qualifiedName = (parent.isEmpty() ? "" : parent + ".") + new String(packageName);
return !isClass(qualifiedName);
}
@Override
public void cleanup() {}
private NameEnvironmentAnswer findType(String className) {
String resourceName = className.replace('.', '/') + ".class";
InputStream is = null;
try {
// we're only asking ECJ to compile a single class; we shouldn't need this
if (className.equals(targetName)) {
return new NameEnvironmentAnswer(targetCompilationUnits[0], null);
}
is = loader.getResourceAsStream(resourceName);
if (is == null) {
is = parentClassLoader.getResourceAsStream(resourceName);
}
if (is != null) {
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
int nRead;
byte[] data = new byte[1024];
while ((nRead = is.read(data, 0, data.length)) != -1) {
buffer.write(data, 0, nRead);
}
buffer.flush();
ClassFileReader cfr =
new ClassFileReader(buffer.toByteArray(), className.toCharArray(), true);
return new NameEnvironmentAnswer(cfr, null);
} else {
return null;
}
} catch (ClassFormatException | IOException ex) {
throw new RuntimeException(ex);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
}
}
}
}
};
ICompilerRequestor requestor =
new ICompilerRequestor() {
@Override
public void acceptResult(CompilationResult result) {
if (result.hasErrors()) {
for (CategorizedProblem problem : result.getProblems()) {
if (problem.isError()) {
problemList.add(problem.getMessage());
}
}
} else {
for (ClassFile clazz : result.getClassFiles()) {
try {
MemJavaFileObject jfo =
(MemJavaFileObject)
fileManager.getJavaFileForOutput(
StandardLocation.CLASS_OUTPUT,
new String(clazz.fileName()),
JavaFileObject.Kind.CLASS,
null);
OutputStream os = jfo.openOutputStream();
os.write(clazz.getBytes());
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
}
}
};
problemList.clear();
IErrorHandlingPolicy policy = DefaultErrorHandlingPolicies.exitAfterAllProblems();
IProblemFactory problemFactory = new DefaultProblemFactory(Locale.getDefault());
try {
// Compiler compiler = new Compiler(env, policy, getCompilerOptions(), requestor,
// problemFactory, true);
Compiler compiler = new Compiler(env, policy, compilerOptions, requestor, problemFactory);
compiler.compile(targetCompilationUnits);
if (!problemList.isEmpty()) {
StringBuilder sb = new StringBuilder();
for (String problem : problemList) {
sb.append("\t").append(problem).append("\n");
}
throw new CodegenException(
"Compilation of " + id + " failed:\n" + source + "\n" + sb.toString());
}
} catch (RuntimeException ex) {
// if we encountered an IOException, unbox and throw it;
// if we encountered a ClassFormatException, box it as an IOException and throw it
// otherwise, it's a legit RuntimeException,
// not one of our checked exceptions boxed as unchecked; just rethrow
Throwable cause = ex.getCause();
if (cause != null) {
if (cause instanceof IOException) {
throw (IOException) cause;
} else if (cause instanceof ClassFormatException) {
throw new IOException(cause);
}
}
throw ex;
}
}
public CompilerOptions getCompilerOptions() {
return compilerOptions;
}
}
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