| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.tools.ant.taskdefs; |
| |
| import java.io.File; |
| import java.util.Iterator; |
| import org.apache.tools.ant.BuildException; |
| import org.apache.tools.ant.Project; |
| import org.apache.tools.ant.types.Path; |
| import org.apache.tools.ant.types.FileSet; |
| import org.apache.tools.ant.types.FileList; |
| import org.apache.tools.ant.types.Resource; |
| import org.apache.tools.ant.types.TimeComparison; |
| import org.apache.tools.ant.types.ResourceCollection; |
| import org.apache.tools.ant.types.resources.Union; |
| import org.apache.tools.ant.types.resources.Restrict; |
| import org.apache.tools.ant.types.resources.Resources; |
| import org.apache.tools.ant.types.resources.FileResource; |
| import org.apache.tools.ant.types.resources.selectors.Not; |
| import org.apache.tools.ant.types.resources.selectors.Exists; |
| import org.apache.tools.ant.types.resources.selectors.ResourceSelector; |
| import org.apache.tools.ant.types.resources.comparators.Reverse; |
| import org.apache.tools.ant.types.resources.comparators.ResourceComparator; |
| |
| /** |
| * Examines and removes out of date target files. If any of the target files |
| * are out of date with respect to any of the source files, all target |
| * files are removed. This is useful where dependencies cannot be |
| * computed (for example, dynamically interpreted parameters or files |
| * that need to stay in synch but are not directly linked) or where |
| * the ant task in question could compute them but does not (for |
| * example, the linked DTD for an XML file using the XSLT task). |
| * |
| * nested arguments: |
| * <ul> |
| * <li>sources (resource union describing the source resources to examine) |
| * <li>srcfileset (fileset describing the source files to examine) |
| * <li>srcfilelist (filelist describing the source files to examine) |
| * <li>targets (path describing the target files to examine) |
| * <li>targetfileset (fileset describing the target files to examine) |
| * <li>targetfilelist (filelist describing the target files to examine) |
| * </ul> |
| * At least one of both source and target entities is required. |
| * <p> |
| * This task will examine each of the sources against each of the target files. If |
| * any target files are out of date with respect to any of the sources, all targets |
| * are removed. If any sources or targets do not exist, all targets are removed. |
| * Hint: If missing files should be ignored, specify them as include patterns |
| * in filesets, rather than using filelists. |
| * </p><p> |
| * This task attempts to optimize speed of dependency checking |
| * by comparing only the dates of the oldest target file and the newest source. |
| * </p><p> |
| * Example uses: |
| * <ul><li> |
| * Record the fact that an XML file must be up to date with respect to its XSD |
| * (Schema file), even though the XML file itself includes no reference to its XSD. |
| * </li><li> |
| * Record the fact that an XSL stylesheet includes other sub-stylesheets |
| * </li><li> |
| * Record the fact that java files must be recompiled if the ant build file changes |
| * </li></ul> |
| * |
| * @ant.task category="filesystem" |
| * @since Ant 1.4 |
| */ |
| public class DependSet extends MatchingTask { |
| |
| private static final ResourceSelector NOT_EXISTS = new Not(new Exists()); |
| private static final ResourceComparator DATE |
| = new org.apache.tools.ant.types.resources.comparators.Date(); |
| private static final ResourceComparator REVERSE_DATE = new Reverse(DATE); |
| |
| private static final class NonExistent extends Restrict { |
| private NonExistent(ResourceCollection rc) { |
| super.add(rc); |
| super.add(NOT_EXISTS); |
| } |
| } |
| |
| private static final class HideMissingBasedir |
| implements ResourceCollection { |
| private FileSet fs; |
| |
| private HideMissingBasedir(FileSet fs) { |
| this.fs = fs; |
| } |
| public Iterator iterator() { |
| return basedirExists() ? fs.iterator() : Resources.EMPTY_ITERATOR; |
| } |
| public int size() { |
| return basedirExists() ? fs.size() : 0; |
| } |
| public boolean isFilesystemOnly() { |
| return true; |
| } |
| private boolean basedirExists() { |
| File basedir = fs.getDir(); |
| //trick to evoke "basedir not set" if null: |
| return basedir == null || basedir.exists(); |
| } |
| } |
| |
| private Union sources = null; |
| private Path targets = null; |
| |
| /** |
| * Create a nested sources element. |
| * @return a Union instance. |
| */ |
| public synchronized Union createSources() { |
| sources = (sources == null) ? new Union() : sources; |
| return sources; |
| } |
| |
| /** |
| * Add a set of source files. |
| * @param fs the FileSet to add. |
| */ |
| public void addSrcfileset(FileSet fs) { |
| createSources().add(fs); |
| } |
| |
| /** |
| * Add a list of source files. |
| * @param fl the FileList to add. |
| */ |
| public void addSrcfilelist(FileList fl) { |
| createSources().add(fl); |
| } |
| |
| /** |
| * Create a nested targets element. |
| * @return a Union instance. |
| */ |
| public synchronized Path createTargets() { |
| targets = (targets == null) ? new Path(getProject()) : targets; |
| return targets; |
| } |
| |
| /** |
| * Add a set of target files. |
| * @param fs the FileSet to add. |
| */ |
| public void addTargetfileset(FileSet fs) { |
| createTargets().add(new HideMissingBasedir(fs)); |
| } |
| |
| /** |
| * Add a list of target files. |
| * @param fl the FileList to add. |
| */ |
| public void addTargetfilelist(FileList fl) { |
| createTargets().add(fl); |
| } |
| |
| /** |
| * Execute the task. |
| * @throws BuildException if errors occur. |
| */ |
| public void execute() throws BuildException { |
| if (sources == null) { |
| throw new BuildException( |
| "At least one set of source resources must be specified"); |
| } |
| if (targets == null) { |
| throw new BuildException( |
| "At least one set of target files must be specified"); |
| } |
| //no sources = nothing to compare; no targets = nothing to delete: |
| if (sources.size() > 0 && targets.size() > 0 && !uptodate(sources, targets)) { |
| log("Deleting all target files.", Project.MSG_VERBOSE); |
| Delete delete = new Delete(); |
| delete.bindToOwner(this); |
| delete.add(targets); |
| delete.perform(); |
| } |
| } |
| |
| private boolean uptodate(ResourceCollection src, ResourceCollection target) { |
| org.apache.tools.ant.types.resources.selectors.Date datesel |
| = new org.apache.tools.ant.types.resources.selectors.Date(); |
| datesel.setMillis(System.currentTimeMillis()); |
| datesel.setWhen(TimeComparison.AFTER); |
| logFuture(targets, datesel); |
| |
| int neTargets = new NonExistent(targets).size(); |
| if (neTargets > 0) { |
| log(neTargets + " nonexistent targets", Project.MSG_VERBOSE); |
| return false; |
| } |
| FileResource oldestTarget = (FileResource) getOldest(targets); |
| log(oldestTarget + " is oldest target file", Project.MSG_VERBOSE); |
| |
| logFuture(sources, datesel); |
| |
| int neSources = new NonExistent(sources).size(); |
| if (neSources > 0) { |
| log(neSources + " nonexistent sources", Project.MSG_VERBOSE); |
| return false; |
| } |
| Resource newestSource = (Resource) getNewest(sources); |
| log(newestSource.toLongString() + " is newest source", Project.MSG_VERBOSE); |
| return oldestTarget.getLastModified() >= newestSource.getLastModified(); |
| } |
| |
| private void logFuture(ResourceCollection rc, ResourceSelector rsel) { |
| Restrict r = new Restrict(); |
| r.add(rsel); |
| r.add(rc); |
| for (Iterator i = r.iterator(); i.hasNext();) { |
| log("Warning: " + i.next() + " modified in the future.", Project.MSG_WARN); |
| } |
| } |
| |
| private Resource getXest(ResourceCollection rc, ResourceComparator c) { |
| Iterator i = rc.iterator(); |
| if (!i.hasNext()) { |
| return null; |
| |
| } |
| Resource xest = (Resource) i.next(); |
| while (i.hasNext()) { |
| Resource next = (Resource) i.next(); |
| if (c.compare(xest, next) < 0) { |
| xest = next; |
| } |
| } |
| return xest; |
| } |
| |
| private Resource getOldest(ResourceCollection rc) { |
| return getXest(rc, REVERSE_DATE); |
| } |
| |
| private Resource getNewest(ResourceCollection rc) { |
| return getXest(rc, DATE); |
| } |
| |
| } |