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/*
 * Janino - An embedded Java[TM] compiler
 *
 * Copyright (c) 2001-2010 Arno Unkrig. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
 * following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *       following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the
 *       following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote
 *       products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.hazelcast.org.codehaus.janino;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.Charset;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;

import com.hazelcast.org.codehaus.commons.compiler.CompileException;
import com.hazelcast.org.codehaus.commons.compiler.ErrorHandler;
import com.hazelcast.org.codehaus.commons.compiler.Location;
import com.hazelcast.org.codehaus.commons.compiler.WarningHandler;
import com.hazelcast.org.codehaus.commons.compiler.util.resource.Resource;
import com.hazelcast.org.codehaus.commons.compiler.util.resource.ResourceFinder;
import com.hazelcast.org.codehaus.commons.nullanalysis.Nullable;
import com.hazelcast.org.codehaus.janino.util.ClassFile;

/**
 * This {@link com.hazelcast.org.codehaus.janino.IClassLoader} finds, scans and parses compilation units.
 * 

* Notice that it does not compile them! *

*/ public class JavaSourceIClassLoader extends IClassLoader { private static final Logger LOGGER = Logger.getLogger(JavaSourceIClassLoader.class.getName()); private ResourceFinder sourceFinder; private Charset sourceCharset; private EnumSet options = EnumSet.noneOf(JaninoOption.class); /** * Collection of parsed compilation units. */ private final Set unitCompilers = new HashSet(); private int sourceVersion = -1; private int targetVersion = -1; @Nullable private ErrorHandler compileErrorHandler; @Nullable private WarningHandler warningHandler; public JavaSourceIClassLoader( ResourceFinder sourceFinder, @Nullable String sourceCharsetName, @Nullable IClassLoader parentIClassLoader ) { super(parentIClassLoader); this.sourceFinder = sourceFinder; this.sourceCharset = sourceCharsetName == null ? Charset.defaultCharset() : Charset.forName(sourceCharsetName); super.postConstruct(); } public void setSourceVersion(int version) { this.sourceVersion = version; } public void setTargetVersion(int version) { this.targetVersion = version; } /** * Returns the set of {@link UnitCompiler}s that were created so far. */ public Set getUnitCompilers() { return this.unitCompilers; } /** * @param sourceFinder The source path */ public void setSourceFinder(ResourceFinder sourceFinder) { this.sourceFinder = sourceFinder; } public ResourceFinder getSourceFinder() { return this.sourceFinder; } /** * @deprecated Use {@link #setSourceCharset(Charset)} instead */ @Deprecated public void setCharacterEncoding(@Nullable String sourceCharsetName) { this.setSourceCharset( sourceCharsetName == null ? Charset.defaultCharset() : Charset.forName(sourceCharsetName) ); } /** * @param sourceCharset The charset that is used to read source files */ public void setSourceCharset(Charset sourceCharset) { this.sourceCharset = sourceCharset; } /** * @see UnitCompiler#setCompileErrorHandler(ErrorHandler) */ public void setCompileErrorHandler(@Nullable ErrorHandler compileErrorHandler) { this.compileErrorHandler = compileErrorHandler; } /** * @see Parser#setWarningHandler(WarningHandler) * @see UnitCompiler#setCompileErrorHandler(ErrorHandler) */ public void setWarningHandler(@Nullable WarningHandler warningHandler) { this.warningHandler = warningHandler; } /** * @return A reference to the currently effective compilation options; changes to it take * effect immediately */ public EnumSet options() { return this.options; } /** * Sets the options for all future compilations. */ public JavaSourceIClassLoader options(EnumSet options) { this.options = options; return this; } /** * @param fieldDescriptor Field descriptor of the {@link IClass} to load, e.g. "Lpkg1/pkg2/Outer$Inner;" * @throws ClassNotFoundException An exception was raised while loading the {@link IClass} */ @Override @Nullable public IClass findIClass(final String fieldDescriptor) throws ClassNotFoundException { JavaSourceIClassLoader.LOGGER.entering(null, "findIClass", fieldDescriptor); // Class type. String className = Descriptor.toClassName(fieldDescriptor); // E.g. "pkg1.pkg2.Outer$Inner" JavaSourceIClassLoader.LOGGER.log(Level.FINE, "className={0}", className); // Do not attempt to load classes from package "java". if (className.startsWith("java.")) return null; // Determine the name of the top-level class. String topLevelClassName; { int idx = className.indexOf('$'); topLevelClassName = idx == -1 ? className : className.substring(0, idx); } // Check the already-parsed compilation units. for (UnitCompiler uc : this.unitCompilers) { IClass res = uc.findClass(topLevelClassName); if (res != null) { if (!className.equals(topLevelClassName)) { res = uc.findClass(className); if (res == null) return null; } this.defineIClass(res); return res; } } try { Java.AbstractCompilationUnit acu = this.findCompilationUnit(className); if (acu == null) return null; UnitCompiler uc = new UnitCompiler(acu, this).options(this.options); uc.setTargetVersion(this.targetVersion); uc.setCompileErrorHandler(this.compileErrorHandler); uc.setWarningHandler(this.warningHandler); // Remember compilation unit for later compilation. this.unitCompilers.add(uc); // Find the class/interface declaration in the compiled unit. IClass res = uc.findClass(className); if (res == null) { if (className.equals(topLevelClassName)) { throw new CompileException( "Compilation unit '" + className + "' does not declare a class with the same name", (Location) null ); } return null; } this.defineIClass(res); return res; } catch (IOException e) { throw new ClassNotFoundException("Parsing compilation unit '" + className + "'", e); } catch (CompileException e) { throw new ClassNotFoundException("Parsing compilation unit '" + className + "'", e); } } /** * Finds the Java source file for the named class through the configured 'source resource finder' and parses it. * * @return {@code null} iff the source file could not be found */ @Nullable protected Java.AbstractCompilationUnit findCompilationUnit(String className) throws IOException, CompileException { // Find source file. Resource sourceResource = this.sourceFinder.findResource(ClassFile.getSourceResourceName(className)); JavaSourceIClassLoader.LOGGER.log(Level.FINE, "sourceResource={0}", sourceResource); if (sourceResource == null) return null; // Scan and parse the source file. InputStream inputStream = sourceResource.open(); try { Scanner scanner = new Scanner( sourceResource.getFileName(), new InputStreamReader(inputStream, this.sourceCharset) ); Parser parser = new Parser(scanner); parser.setSourceVersion(this.sourceVersion); parser.setWarningHandler(this.warningHandler); return parser.parseAbstractCompilationUnit(); } finally { try { inputStream.close(); } catch (IOException ex) {} } } }




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