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A plugin for compiling OSGi bundles
/*
* Copyright 2006 The Apache Software Foundation.
*
* 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 copied.org.apache.maven.plugin;
import java.io.File;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugin.MojoFailureException;
import org.apache.maven.plugins.annotations.Component;
import org.apache.maven.plugins.annotations.Parameter;
import org.codehaus.plexus.compiler.Compiler;
import org.codehaus.plexus.compiler.CompilerConfiguration;
import org.codehaus.plexus.compiler.CompilerException;
import org.codehaus.plexus.compiler.CompilerMessage;
import org.codehaus.plexus.compiler.CompilerOutputStyle;
import org.codehaus.plexus.compiler.CompilerResult;
import org.codehaus.plexus.compiler.manager.CompilerManager;
import org.codehaus.plexus.compiler.manager.NoSuchCompilerException;
import org.codehaus.plexus.compiler.util.scan.InclusionScanException;
import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
import org.codehaus.plexus.compiler.util.scan.mapping.SingleTargetSourceMapping;
import org.codehaus.plexus.compiler.util.scan.mapping.SourceMapping;
import org.codehaus.plexus.compiler.util.scan.mapping.SuffixMapping;
import org.codehaus.plexus.util.StringUtils;
/**
* TODO: At least one step could be optimized, currently the plugin will do two scans of all the
* source code if the compiler has to have the entire set of sources. This is currently the case for
* at least the C# compiler and most likely all the other .NET compilers too.
*
* @author others
* @author Trygve Laugstøl
* @author Jan Sievers (SAP) added support for annotation processor options
* @version $Id: AbstractCompilerMojo.java 210 2007-02-20 03:02:41Z jvanzyl $
*/
public abstract class AbstractCompilerMojo extends AbstractMojo {
public static final String DEFAULT_SOURCE_VERSION = "1.7";
public static final String DEFAULT_TARGET_VERSION = "1.7";
// ----------------------------------------------------------------------
// Configurables
// ----------------------------------------------------------------------
/**
* Whether to include debugging information in the compiled class files. The default value is
* true.
*/
@Parameter(property = "maven.compiler.debug", defaultValue = "true")
private boolean debug;
/**
* Whether to output messages about what the compiler is doing
*/
@Parameter(property = "maven.compiler.verbose", defaultValue = "false")
private boolean verbose;
/**
* Output source locations where deprecated APIs are used
*/
@Parameter(property = "maven.compiler.showDeprecation", defaultValue = "false")
private boolean showDeprecation;
/**
* Optimize compiled code using the compiler's optimization methods
*/
@Parameter(property = "maven.compiler.optimize", defaultValue = "false")
private boolean optimize;
/**
* Output warnings
*/
@Parameter(property = "maven.compiler.showWarnings", defaultValue = "false")
private boolean showWarnings;
/**
* The -source argument for the Java compiler
*/
@Parameter(property = "maven.compiler.source")
protected String source;
/**
* The -target argument for the Java compiler
*/
@Parameter(property = "maven.compiler.target")
protected String target;
/**
* The -encoding argument for the Java compiler (kept for backwards compatibility)
*
* @deprecated use {@link #encoding}
*/
@Parameter(property = "maven.compiler.encoding", readonly = true)
private String mavenCompilerEncoding;
/**
* The -encoding argument for the Java compiler
*/
@Parameter(property = "project.build.sourceEncoding")
private String encoding;
/**
* The granularity in milliseconds of the last modification date for testing whether a source
* needs recompilation
*/
@Parameter(property = "lastModGranularityMs", defaultValue = "0")
private int staleMillis;
/**
* The compiler id of the compiler to use.
*/
@Parameter(property = "maven.compiler.compilerId", defaultValue = "jdt")
private String compilerId;
/**
* Version of the compiler to use, ex. "1.3", "1.5", if fork is set to true
*/
@Parameter(property = "maven.compiler.compilerVersion")
private String compilerVersion;
/**
* Allows running the compiler in a separate process. If "false" it uses the built in compiler,
* while if "true" it will use an executable.
*/
@Parameter(defaultValue = "false")
private boolean fork;
/**
* Initial size, in megabytes, of the memory allocation pool, ex. "64", "64m" if fork is set to
* true
*/
@Parameter(property = "maven.compiler.meminitial")
private String meminitial;
/**
* maximum size, in megabytes, of the memory allocation pool, ex. "128", "128m" if fork is set
* to true
*/
@Parameter(property = "maven.compiler.maxmem")
private String maxmem;
/**
* The executable of the compiler to use when fork is true.
*/
@Parameter(property = "maven.compiler.executable")
private String executable;
/**
* If only is specified, the annotation processors will run but no compilation will be
* performed. If none is specified, annotation processors will not be discovered or
* run; compilation will proceed as if no annotation processors were found. By default the
* compiler must search the classpath for annotation processors, so specifying none may
* speed compilation if annotation processing is not required. This parameter requires a 1.6 VM
* or above and is used only if the compliance is 1.6
*
* @since 0.16.0
*/
@Parameter
private String proc;
/**
* Qualified class names of annotation processors to run. If specified, the
*
* normal processor discovery process will be skipped. This parameter requires a 1.6 VM or
* above and is used only if the compliance is 1.6
*
* @since 0.16.0
*/
@Parameter
private String[] annotationProcessors;
/**
* The directory where source files generated by annotation processors will be created. This
* parameter requires a 1.6 VM or above and is used only if the compliance is 1.6.
*
* @since 0.16.0
*/
@Parameter(defaultValue = "${project.build.directory}/generated-sources/annotations")
private File generatedSourcesDirectory;
/**
*
* Arguments to be passed to the compiler (prepending a dash) if fork is set to true.
*
*
* This is because the list of valid arguments passed to a Java compiler varies based on the
* compiler version.
*
*
* @deprecated use {@link #compilerArgs} instead.
*/
@Parameter
private Map compilerArguments;
/**
* Arguments to be passed to the compiler.
*
* @since 0.17.0
*/
@Parameter
private List compilerArgs;
/**
*
* Unformatted argument string to be passed to the compiler if fork is set to true.
*
*
* This is because the list of valid arguments passed to a Java compiler varies based on the
* compiler version.
*
*/
@Parameter
private String compilerArgument;
/**
* Used to control the name of the output file when compiling a set of sources to a single file.
*/
@Parameter(property = "project.build.finalName")
private String outputFileName;
// ----------------------------------------------------------------------
// Read-only parameters
// ----------------------------------------------------------------------
/**
* The directory to run the compiler from if fork is true.
*/
@Parameter(property = "basedir", required = true, readonly = true)
private File basedir;
/**
* The target directory of the compiler if fork is true.
*/
@Parameter(property = "project.build.directory", readonly = true, required = true)
private File buildDirectory;
/**
* Plexus compiler manager.
*/
@Component
private CompilerManager compilerManager;
protected abstract SourceInclusionScanner getSourceInclusionScanner(int staleMillis);
protected abstract SourceInclusionScanner getSourceInclusionScanner(String inputFileEnding);
protected abstract List getClasspathElements() throws MojoExecutionException;
protected abstract List getCompileSourceRoots() throws MojoExecutionException;
protected abstract File getOutputDirectory();
@Override
public void execute() throws MojoExecutionException, MojoFailureException {
// ----------------------------------------------------------------------
// Look up the compiler. This is done before other code than can
// cause the mojo to return before the lookup is done possibly resulting
// in misconfigured POMs still building.
// ----------------------------------------------------------------------
Compiler compiler;
getLog().debug("Using compiler '" + compilerId + "'.");
try {
compiler = compilerManager.getCompiler(compilerId);
} catch (NoSuchCompilerException e) {
throw new MojoExecutionException("No such compiler '" + e.getCompilerId() + "'.");
}
// ----------------------------------------------------------------------
//
// ----------------------------------------------------------------------
List compileSourceRoots = removeEmptyCompileSourceRoots(getCompileSourceRoots());
if (compileSourceRoots.isEmpty()) {
getLog().info("No sources to compile");
return;
}
if (getLog().isDebugEnabled()) {
getLog().debug("Source directories: " + compileSourceRoots.toString().replace(',', '\n'));
getLog().debug("Classpath: " + getClasspathElements().toString().replace(',', '\n'));
getLog().debug("Output directory: " + getOutputDirectory());
}
// ----------------------------------------------------------------------
// Create the compiler configuration
// ----------------------------------------------------------------------
CompilerConfiguration compilerConfiguration = getCompilerConfiguration(compileSourceRoots);
// TODO: have an option to always compile (without need to clean)
Set staleSources;
boolean canUpdateTarget;
try {
staleSources = computeStaleSources(compilerConfiguration, compiler, getSourceInclusionScanner(staleMillis));
canUpdateTarget = compiler.canUpdateTarget(compilerConfiguration);
if (compiler.getCompilerOutputStyle().equals(CompilerOutputStyle.ONE_OUTPUT_FILE_FOR_ALL_INPUT_FILES)
&& !canUpdateTarget) {
getLog().info("RESCANNING!");
// TODO: This second scan for source files is sub-optimal
String inputFileEnding = compiler.getInputFileEnding(compilerConfiguration);
Set sources = computeStaleSources(compilerConfiguration, compiler,
getSourceInclusionScanner(inputFileEnding));
compilerConfiguration.setSourceFiles(sources);
} else {
compilerConfiguration.setSourceFiles(staleSources);
}
} catch (CompilerException e) {
throw new MojoExecutionException("Error while computing stale sources.", e);
}
if (staleSources.isEmpty()) {
getLog().info("Nothing to compile - all classes are up to date");
return;
}
// ----------------------------------------------------------------------
// Dump configuration
// ----------------------------------------------------------------------
if (getLog().isDebugEnabled()) {
getLog().debug("Classpath:");
for (Iterator it = getClasspathElements().iterator(); it.hasNext();) {
String s = it.next();
getLog().debug(" " + s);
}
getLog().debug("Source roots:");
for (Iterator it = getCompileSourceRoots().iterator(); it.hasNext();) {
String root = (String) it.next();
getLog().debug(" " + root);
}
if (fork) {
try {
if (compilerConfiguration.getExecutable() != null) {
getLog().debug("Excutable: ");
getLog().debug(" " + compilerConfiguration.getExecutable());
}
String[] cl = compiler.createCommandLine(compilerConfiguration);
if (cl != null && cl.length > 0) {
StringBuffer sb = new StringBuffer();
sb.append(cl[0]);
for (int i = 1; i < cl.length; i++) {
sb.append(" ");
sb.append(cl[i]);
}
getLog().debug("Command line options:");
getLog().debug(sb);
}
} catch (CompilerException ce) {
getLog().debug(ce);
}
}
}
// ----------------------------------------------------------------------
// Compile!
// ----------------------------------------------------------------------
CompilerResult result;
try {
result = compiler.performCompile(compilerConfiguration);
} catch (Exception e) {
// TODO: don't catch Exception
throw new MojoExecutionException("Fatal error compiling", e);
}
List messages = result.getCompilerMessages();
for (Iterator i = messages.iterator(); i.hasNext();) {
CompilerMessage message = i.next();
if (!message.isError()) {
getLog().warn(message.toString());
i.remove();
}
}
if (!result.isSuccess()) {
throw new CompilationFailureException(messages);
}
}
protected CompilerConfiguration getCompilerConfiguration(List compileSourceRoots)
throws MojoExecutionException, MojoFailureException {
CompilerConfiguration compilerConfiguration = new CompilerConfiguration();
compilerConfiguration.setOutputLocation(getOutputDirectory().getAbsolutePath());
compilerConfiguration.setClasspathEntries(getClasspathElements());
compilerConfiguration.setSourceLocations(compileSourceRoots);
compilerConfiguration.setOptimize(optimize);
compilerConfiguration.setDebug(debug);
compilerConfiguration.setVerbose(verbose);
compilerConfiguration.setShowWarnings(showWarnings);
compilerConfiguration.setShowDeprecation(showDeprecation);
compilerConfiguration.setProc(proc);
compilerConfiguration.setAnnotationProcessors(annotationProcessors);
compilerConfiguration.setGeneratedSourcesDirectory(generatedSourcesDirectory);
compilerConfiguration.setSourceVersion(source != null ? source : DEFAULT_SOURCE_VERSION);
compilerConfiguration.setTargetVersion(target != null ? target : DEFAULT_TARGET_VERSION);
compilerConfiguration.setSourceEncoding(getEncoding());
if ((compilerArguments != null) || (compilerArgument != null) || compilerArgs != null) {
LinkedHashMap cplrArgsCopy = new LinkedHashMap<>();
if (compilerArguments != null) {
for (Iterator i = compilerArguments.entrySet().iterator(); i.hasNext();) {
Map.Entry me = (Map.Entry) i.next();
String key = (String) me.getKey();
String value = (String) me.getValue();
if (!key.startsWith("-")) {
key = "-" + key;
}
if (key.startsWith("-A") && StringUtils.isNotEmpty(value)) {
cplrArgsCopy.put(key + "=" + value, null);
} else {
cplrArgsCopy.put(key, value);
}
}
}
if (!StringUtils.isEmpty(compilerArgument)) {
cplrArgsCopy.put(compilerArgument, null);
}
if (compilerArgs != null) {
for (String arg : compilerArgs) {
cplrArgsCopy.put(arg, null);
}
}
compilerConfiguration.setCustomCompilerArguments(cplrArgsCopy);
}
compilerConfiguration.setFork(fork);
if (fork) {
if (!StringUtils.isEmpty(meminitial)) {
String value = getMemoryValue(meminitial);
if (value != null) {
compilerConfiguration.setMeminitial(value);
} else {
getLog().info("Invalid value for meminitial '" + meminitial + "'. Ignoring this option.");
}
}
if (!StringUtils.isEmpty(maxmem)) {
String value = getMemoryValue(maxmem);
if (value != null) {
compilerConfiguration.setMaxmem(value);
} else {
getLog().info("Invalid value for maxmem '" + maxmem + "'. Ignoring this option.");
}
}
}
compilerConfiguration.setExecutable(executable);
compilerConfiguration.setWorkingDirectory(basedir);
compilerConfiguration.setCompilerVersion(compilerVersion);
compilerConfiguration.setBuildDirectory(buildDirectory);
compilerConfiguration.setOutputFileName(outputFileName);
return compilerConfiguration;
}
private String getEncoding() {
if (encoding != null) {
return encoding;
}
return mavenCompilerEncoding;
}
private String getMemoryValue(String setting) {
String value = null;
// Allow '128' or '128m'
if (isDigits(setting)) {
value = setting + "m";
} else {
if ((isDigits(setting.substring(0, setting.length() - 1))) && (setting.toLowerCase().endsWith("m"))) {
value = setting;
}
}
return value;
}
private boolean isDigits(String string) {
for (int i = 0; i < string.length(); i++) {
if (!Character.isDigit(string.charAt(i))) {
return false;
}
}
return true;
}
private Set computeStaleSources(CompilerConfiguration compilerConfiguration, Compiler compiler,
SourceInclusionScanner scanner) throws MojoExecutionException, CompilerException {
CompilerOutputStyle outputStyle = compiler.getCompilerOutputStyle();
SourceMapping mapping;
File outputDirectory;
if (outputStyle == CompilerOutputStyle.ONE_OUTPUT_FILE_PER_INPUT_FILE) {
mapping = new SuffixMapping(compiler.getInputFileEnding(compilerConfiguration),
compiler.getOutputFileEnding(compilerConfiguration));
outputDirectory = getOutputDirectory();
} else if (outputStyle == CompilerOutputStyle.ONE_OUTPUT_FILE_FOR_ALL_INPUT_FILES) {
mapping = new SingleTargetSourceMapping(compiler.getInputFileEnding(compilerConfiguration),
compiler.getOutputFile(compilerConfiguration));
outputDirectory = buildDirectory;
} else {
throw new MojoExecutionException("Unknown compiler output style: '" + outputStyle + "'.");
}
scanner.addSourceMapping(mapping);
Set staleSources = new HashSet<>();
for (Iterator it = getCompileSourceRoots().iterator(); it.hasNext();) {
String sourceRoot = (String) it.next();
File rootFile = new File(sourceRoot);
if (!rootFile.isDirectory()) {
continue;
}
try {
staleSources.addAll(scanner.getIncludedSources(rootFile, outputDirectory));
} catch (InclusionScanException e) {
throw new MojoExecutionException(
"Error scanning source root: \'" + sourceRoot + "\' " + "for stale files to recompile.", e);
}
}
return staleSources;
}
/**
* @todo also in ant plugin. This should be resolved at some point so that it does not need to
* be calculated continuously - or should the plugins accept empty source roots as is?
*/
protected static List removeEmptyCompileSourceRoots(List compileSourceRootsList) {
List newCompileSourceRootsList = new ArrayList<>();
if (compileSourceRootsList != null) {
// copy as I may be modifying it
for (Iterator i = compileSourceRootsList.iterator(); i.hasNext();) {
String srcDir = (String) i.next();
if (!newCompileSourceRootsList.contains(srcDir) && new File(srcDir).exists()) {
newCompileSourceRootsList.add(srcDir);
}
}
}
return newCompileSourceRootsList;
}
}