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-rw-r--r--src/net/sf/antcontrib/cpptasks/TargetHistoryTable.java430
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diff --git a/src/net/sf/antcontrib/cpptasks/TargetHistoryTable.java b/src/net/sf/antcontrib/cpptasks/TargetHistoryTable.java
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--- a/src/net/sf/antcontrib/cpptasks/TargetHistoryTable.java
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-/*
- *
- * Copyright 2002-2004 The Ant-Contrib project
- *
- * 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 net.sf.antcontrib.cpptasks;
-import java.io.BufferedWriter;
-import java.io.File;
-import java.io.FileOutputStream;
-import java.io.IOException;
-import java.io.OutputStreamWriter;
-import java.io.UnsupportedEncodingException;
-import java.util.Enumeration;
-import java.util.Hashtable;
-import java.util.Vector;
-
-import javax.xml.parsers.SAXParser;
-import javax.xml.parsers.SAXParserFactory;
-
-import net.sf.antcontrib.cpptasks.compiler.ProcessorConfiguration;
-
-import org.apache.tools.ant.BuildException;
-import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
-import org.xml.sax.helpers.DefaultHandler;
-/**
- * A history of the compiler and linker settings used to build the files in the
- * same directory as the history.
- *
- * @author Curt Arnold
- */
-public final class TargetHistoryTable {
- /**
- * This class handles populates the TargetHistory hashtable in response to
- * SAX parse events
- */
- private class TargetHistoryTableHandler extends DefaultHandler {
- private final File baseDir;
- private String config;
- private final Hashtable history;
- private String output;
- private long outputLastModified;
- private final Vector sources = new Vector();
- /**
- * Constructor
- *
- * @param history
- * hashtable of TargetHistory keyed by output name
- * @param outputFiles
- * existing files in output directory
- */
- private TargetHistoryTableHandler(Hashtable history, File baseDir) {
- this.history = history;
- config = null;
- output = null;
- this.baseDir = baseDir;
- }
- public void endElement(String namespaceURI, String localName,
- String qName) throws SAXException {
- //
- // if </target> then
- // create TargetHistory object and add to hashtable
- // if corresponding output file exists and
- // has the same timestamp
- //
- if (qName.equals("target")) {
- if (config != null && output != null) {
- File existingFile = new File(baseDir, output);
- //
- // if the corresponding files doesn't exist or has a
- // different
- // modification time, then discard this record
- if (existingFile.exists()) {
- //
- // would have expected exact time stamps
- // but have observed slight differences
- // in return value for multiple evaluations of
- // lastModified(). Check if times are within
- // a second
- long existingLastModified = existingFile.lastModified();
- if (!CUtil.isSignificantlyBefore(existingLastModified, outputLastModified)
- && !CUtil.isSignificantlyAfter(existingLastModified, outputLastModified)) {
- SourceHistory[] sourcesArray = new SourceHistory[sources
- .size()];
- sources.copyInto(sourcesArray);
- TargetHistory targetHistory = new TargetHistory(
- config, output, outputLastModified,
- sourcesArray);
- history.put(output, targetHistory);
- }
- }
- }
- output = null;
- sources.setSize(0);
- } else {
- //
- // reset config so targets not within a processor element
- // don't pick up a previous processors signature
- //
- if (qName.equals("processor")) {
- config = null;
- }
- }
- }
- /**
- * startElement handler
- */
- public void startElement(String namespaceURI, String localName,
- String qName, Attributes atts) throws SAXException {
- //
- // if sourceElement
- //
- if (qName.equals("source")) {
- String sourceFile = atts.getValue("file");
- long sourceLastModified = Long.parseLong(atts
- .getValue("lastModified"), 16);
- sources.addElement(new SourceHistory(sourceFile,
- sourceLastModified));
- } else {
- //
- // if <target> element,
- // grab file name and lastModified values
- // TargetHistory object will be created in endElement
- //
- if (qName.equals("target")) {
- sources.setSize(0);
- output = atts.getValue("file");
- outputLastModified = Long.parseLong(atts
- .getValue("lastModified"), 16);
- } else {
- //
- // if <processor> element,
- // grab signature attribute
- //
- if (qName.equals("processor")) {
- config = atts.getValue("signature");
- }
- }
- }
- }
- }
- /** Flag indicating whether the cache should be written back to file. */
- private boolean dirty;
- /**
- * a hashtable of TargetHistory's keyed by output file name
- */
- private final Hashtable history = new Hashtable();
- /** The file the cache was loaded from. */
- private/* final */File historyFile;
- private/* final */File outputDir;
- private String outputDirPath;
- /**
- * Creates a target history table from history.xml in the output directory,
- * if it exists. Otherwise, initializes the history table empty.
- *
- * @param task
- * task used for logging history load errors
- * @param outputDir
- * output directory for task
- */
- public TargetHistoryTable(CCTask task, File outputDir)
- throws BuildException {
- if (outputDir == null) {
- throw new NullPointerException("outputDir");
- }
- if (!outputDir.isDirectory()) {
- throw new BuildException("Output directory is not a directory");
- }
- if (!outputDir.exists()) {
- throw new BuildException("Output directory does not exist");
- }
- this.outputDir = outputDir;
- try {
- outputDirPath = outputDir.getCanonicalPath();
- } catch (IOException ex) {
- outputDirPath = outputDir.toString();
- }
- //
- // load any existing history from file
- // suppressing any records whose corresponding
- // file does not exist, is zero-length or
- // last modified dates differ
- historyFile = new File(outputDir, "history.xml");
- if (historyFile.exists()) {
- SAXParserFactory factory = SAXParserFactory.newInstance();
- factory.setValidating(false);
- try {
- SAXParser parser = factory.newSAXParser();
- parser.parse(historyFile, new TargetHistoryTableHandler(
- history, outputDir));
- } catch (Exception ex) {
- //
- // a failure on loading this history is not critical
- // but should be logged
- task.log("Error reading history.xml: " + ex.toString());
- }
- } else {
- //
- // create empty history file for identifying new files by last
- // modified
- // timestamp comperation (to compare with
- // System.currentTimeMillis() don't work on Unix, because it
- // maesure timestamps only in seconds).
- //
- try {
- FileOutputStream outputStream = new FileOutputStream(
- historyFile);
- byte[] historyElement = new byte[]{0x3C, 0x68, 0x69, 0x73,
- 0x74, 0x6F, 0x72, 0x79, 0x2F, 0x3E};
- outputStream.write(historyElement);
- outputStream.close();
- } catch (IOException ex) {
- throw new BuildException("Can't create history file", ex);
- }
- }
- }
- public void commit() throws IOException {
- //
- // if not dirty, no need to update file
- //
- if (dirty) {
- //
- // build (small) hashtable of config id's in history
- //
- Hashtable configs = new Hashtable(20);
- Enumeration elements = history.elements();
- while (elements.hasMoreElements()) {
- TargetHistory targetHistory = (TargetHistory) elements
- .nextElement();
- String configId = targetHistory.getProcessorConfiguration();
- if (configs.get(configId) == null) {
- configs.put(configId, configId);
- }
- }
- FileOutputStream outStream = new FileOutputStream(historyFile);
- OutputStreamWriter outWriter;
- //
- // early VM's don't support UTF-8 encoding
- // try and fallback to the default encoding
- // otherwise
- String encodingName = "UTF-8";
- try {
- outWriter = new OutputStreamWriter(outStream, "UTF-8");
- } catch (UnsupportedEncodingException ex) {
- outWriter = new OutputStreamWriter(outStream);
- encodingName = outWriter.getEncoding();
- }
- BufferedWriter writer = new BufferedWriter(outWriter);
- writer.write("<?xml version='1.0' encoding='");
- writer.write(encodingName);
- writer.write("'?>\n");
- writer.write("<history>\n");
- StringBuffer buf = new StringBuffer(200);
- Enumeration configEnum = configs.elements();
- while (configEnum.hasMoreElements()) {
- String configId = (String) configEnum.nextElement();
- buf.setLength(0);
- buf.append(" <processor signature=\"");
- buf.append(CUtil.xmlAttribEncode(configId));
- buf.append("\">\n");
- writer.write(buf.toString());
- elements = history.elements();
- while (elements.hasMoreElements()) {
- TargetHistory targetHistory = (TargetHistory) elements
- .nextElement();
- if (targetHistory.getProcessorConfiguration().equals(
- configId)) {
- buf.setLength(0);
- buf.append(" <target file=\"");
- buf.append(CUtil.xmlAttribEncode(targetHistory
- .getOutput()));
- buf.append("\" lastModified=\"");
- buf.append(Long.toHexString(targetHistory
- .getOutputLastModified()));
- buf.append("\">\n");
- writer.write(buf.toString());
- SourceHistory[] sourceHistories = targetHistory
- .getSources();
- for (int i = 0; i < sourceHistories.length; i++) {
- buf.setLength(0);
- buf.append(" <source file=\"");
- buf.append(CUtil.xmlAttribEncode(sourceHistories[i]
- .getRelativePath()));
- buf.append("\" lastModified=\"");
- buf.append(Long.toHexString(sourceHistories[i]
- .getLastModified()));
- buf.append("\"/>\n");
- writer.write(buf.toString());
- }
- writer.write(" </target>\n");
- }
- }
- writer.write(" </processor>\n");
- }
- writer.write("</history>\n");
- writer.close();
- dirty = false;
- }
- }
- public TargetHistory get(String configId, String outputName) {
- TargetHistory targetHistory = (TargetHistory) history.get(outputName);
- if (targetHistory != null) {
- if (!targetHistory.getProcessorConfiguration().equals(configId)) {
- targetHistory = null;
- }
- }
- return targetHistory;
- }
- public void markForRebuild(Hashtable targetInfos) {
- Enumeration targetInfoEnum = targetInfos.elements();
- while (targetInfoEnum.hasMoreElements()) {
- markForRebuild((TargetInfo) targetInfoEnum.nextElement());
- }
- }
- public void markForRebuild(TargetInfo targetInfo) {
- //
- // if it must already be rebuilt, no need to check further
- //
- if (!targetInfo.getRebuild()) {
- TargetHistory history = get(targetInfo.getConfiguration()
- .toString(), targetInfo.getOutput().getName());
- if (history == null) {
- targetInfo.mustRebuild();
- } else {
- SourceHistory[] sourceHistories = history.getSources();
- File[] sources = targetInfo.getSources();
- if (sourceHistories.length != sources.length) {
- targetInfo.mustRebuild();
- } else {
- Hashtable sourceMap = new Hashtable(sources.length);
- for (int i = 0; i < sources.length; i++) {
- try {
- sourceMap.put(sources[i].getCanonicalPath(), sources[i]);
- } catch(IOException ex) {
- sourceMap.put(sources[i].getAbsolutePath(), sources[i]);
- }
- }
- for (int i = 0; i < sourceHistories.length; i++) {
- //
- // relative file name, must absolutize it on output
- // directory
- //
- String absPath = sourceHistories[i].getAbsolutePath(outputDir);
- File match = (File) sourceMap.get(absPath);
- if (match != null) {
- try {
- match = (File) sourceMap.get(new File(absPath).getCanonicalPath());
- } catch(IOException ex) {
- targetInfo.mustRebuild();
- break;
- }
- }
- if (match == null || match.lastModified() != sourceHistories[i].getLastModified()) {
- targetInfo.mustRebuild();
- break;
- }
- }
- }
- }
- }
- }
- public void update(ProcessorConfiguration config, String[] sources, VersionInfo versionInfo) {
- String configId = config.getIdentifier();
- String[] onesource = new String[1];
- String[] outputNames;
- for (int i = 0; i < sources.length; i++) {
- onesource[0] = sources[i];
- outputNames = config.getOutputFileNames(sources[i], versionInfo);
- for (int j = 0; j < outputNames.length; j++) {
- update(configId, outputNames[j], onesource);
- }
- }
- }
- private void update(String configId, String outputName, String[] sources) {
- File outputFile = new File(outputDir, outputName);
- //
- // if output file doesn't exist or predates the start of the
- // compile step (most likely a compilation error) then
- // do not write add a history entry
- //
- if (outputFile.exists() &&
- !CUtil.isSignificantlyBefore(outputFile.lastModified(), historyFile.lastModified())) {
- dirty = true;
- history.remove(outputName);
- SourceHistory[] sourceHistories = new SourceHistory[sources.length];
- for (int i = 0; i < sources.length; i++) {
- File sourceFile = new File(sources[i]);
- long lastModified = sourceFile.lastModified();
- String relativePath = CUtil.getRelativePath(outputDirPath,
- sourceFile);
- sourceHistories[i] = new SourceHistory(relativePath,
- lastModified);
- }
- TargetHistory newHistory = new TargetHistory(configId, outputName,
- outputFile.lastModified(), sourceHistories);
- history.put(outputName, newHistory);
- }
- }
- public void update(TargetInfo linkTarget) {
- File outputFile = linkTarget.getOutput();
- String outputName = outputFile.getName();
- //
- // if output file doesn't exist or predates the start of the
- // compile or link step (most likely a compilation error) then
- // do not write add a history entry
- //
- if (outputFile.exists()
- && !CUtil.isSignificantlyBefore(outputFile.lastModified(),historyFile.lastModified())) {
- dirty = true;
- history.remove(outputName);
- SourceHistory[] sourceHistories = linkTarget
- .getSourceHistories(outputDirPath);
- TargetHistory newHistory = new TargetHistory(linkTarget
- .getConfiguration().getIdentifier(), outputName, outputFile
- .lastModified(), sourceHistories);
- history.put(outputName, newHistory);
- }
- }
-}
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