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Ant example source code file (UpToDate.java)

This example Ant source code file (UpToDate.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Ant tags/keywords

buildexception, buildexception, file, file, filenamemapper, fileset, io, mapper, mergingmapper, sourcefilescanner, sourcefilescanner, string, string, union, util, vector

The UpToDate.java source code

/*
 *  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.Enumeration;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.condition.Condition;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.FileSet;
import org.apache.tools.ant.types.resources.Union;
import org.apache.tools.ant.types.Mapper;
import org.apache.tools.ant.util.FileNameMapper;
import org.apache.tools.ant.util.MergingMapper;
import org.apache.tools.ant.util.ResourceUtils;
import org.apache.tools.ant.util.SourceFileScanner;

/**
 * Sets the given property if the specified target has a timestamp
 * greater than all of the source files.
 *
 * @since Ant 1.2
 *
 * @ant.task category="control"
 */

public class UpToDate extends Task implements Condition {

    private String property;
    private String value;
    private File sourceFile;
    private File targetFile;
    private Vector sourceFileSets = new Vector();
    private Union sourceResources = new Union();

    // CheckStyle:VisibilityModifier OFF - bc
    protected Mapper mapperElement = null;
    // CheckStyle:VisibilityModifier ON

    /**
     * The property to set if the target file is more up-to-date than
     * (each of) the source file(s).
     *
     * @param property the name of the property to set if Target is up-to-date.
     */
    public void setProperty(final String property) {
        this.property = property;
    }

    /**
     * The value to set the named property to if the target file is more
     * up-to-date than (each of) the source file(s). Defaults to 'true'.
     *
     * @param value the value to set the property to if Target is up-to-date
     */
    public void setValue(final String value) {
        this.value = value;
    }

    /**
     * Returns the value, or "true" if a specific value wasn't provided.
     */
    private String getValue() {
        return (value != null) ? value : "true";
    }

    /**
     * The file which must be more up-to-date than (each of) the source file(s)
     * if the property is to be set.
     *
     * @param file the file we are checking against.
     */
    public void setTargetFile(final File file) {
        this.targetFile = file;
    }

    /**
     * The file that must be older than the target file
     * if the property is to be set.
     *
     * @param file the file we are checking against the target file.
     */
    public void setSrcfile(final File file) {
        this.sourceFile = file;
    }

    /**
     * Nested <srcfiles> element.
     * @param fs the source files
     */
    public void addSrcfiles(final FileSet fs) {
        sourceFileSets.addElement(fs);
    }

    /**
     * Nested resource collections as sources.
     * @return the source resources to configure.
     * @since Ant 1.7
     */
    public Union createSrcResources() {
        return sourceResources;
    }

    /**
     * Defines the FileNameMapper to use (nested mapper element).
     * @return a mapper to be configured
     * @throws BuildException if more than one mapper is defined
     */
    public Mapper createMapper() throws BuildException {
        if (mapperElement != null) {
            throw new BuildException("Cannot define more than one mapper",
                                     getLocation());
        }
        mapperElement = new Mapper(getProject());
        return mapperElement;
    }

    /**
     * A nested filenamemapper
     * @param fileNameMapper the mapper to add
     * @since Ant 1.6.3
     */
    public void add(FileNameMapper fileNameMapper) {
        createMapper().add(fileNameMapper);
    }

    /**
     * Evaluate (all) target and source file(s) to
     * see if the target(s) is/are up-to-date.
     * @return true if the target(s) is/are up-to-date
     */
    public boolean eval() {
        if (sourceFileSets.size() == 0 && sourceResources.size() == 0
            && sourceFile == null) {
            throw new BuildException("At least one srcfile or a nested "
                                     + "<srcfiles> or  element "
                                     + "must be set.");
        }

        if ((sourceFileSets.size() > 0 || sourceResources.size() > 0)
            && sourceFile != null) {
            throw new BuildException("Cannot specify both the srcfile "
                                     + "attribute and a nested <srcfiles> "
                                     + "or <srcresources> element.");
        }

        if (targetFile == null && mapperElement == null) {
            throw new BuildException("The targetfile attribute or a nested "
                                     + "mapper element must be set.");
        }

        // if the target file is not there, then it can't be up-to-date
        if (targetFile != null && !targetFile.exists()) {
            log("The targetfile \"" + targetFile.getAbsolutePath()
                    + "\" does not exist.", Project.MSG_VERBOSE);
            return false;
        }

        // if the source file isn't there, throw an exception
        if (sourceFile != null && !sourceFile.exists()) {
            throw new BuildException(sourceFile.getAbsolutePath()
                                     + " not found.");
        }

        boolean upToDate = true;
        if (sourceFile != null) {
            if (mapperElement == null) {
                upToDate = upToDate
                    && (targetFile.lastModified() >= sourceFile.lastModified());
            } else {
                SourceFileScanner sfs = new SourceFileScanner(this);
                upToDate = upToDate
                    && (sfs.restrict(new String[] {sourceFile.getAbsolutePath()},
                                  null, null,
                                  mapperElement.getImplementation()).length == 0);
            }
        }

        // filesets are separate from the rest for performance
        // reasons.  If we use the code for union below, we'll always
        // scan all filesets, even if we know the target is out of
        // date after the first test.
        Enumeration e = sourceFileSets.elements();
        while (upToDate && e.hasMoreElements()) {
            FileSet fs = (FileSet) e.nextElement();
            DirectoryScanner ds = fs.getDirectoryScanner(getProject());
            upToDate = upToDate && scanDir(fs.getDir(getProject()),
                                           ds.getIncludedFiles());
        }

        if (upToDate) {
            Resource[] r = sourceResources.listResources();
            upToDate = upToDate
                && (ResourceUtils.selectOutOfDateSources(
                        this, r, getMapper(), getProject()).length == 0);
        }

        return upToDate;
    }


    /**
     * Sets property to true if target file(s) have a more recent timestamp
     * than (each of) the corresponding source file(s).
     * @throws BuildException on error
     */
    public void execute() throws BuildException {
        if (property == null) {
            throw new BuildException("property attribute is required.",
                                     getLocation());
        }
        boolean upToDate = eval();
        if (upToDate) {
            getProject().setNewProperty(property, getValue());
            if (mapperElement == null) {
                log("File \"" + targetFile.getAbsolutePath()
                    + "\" is up-to-date.", Project.MSG_VERBOSE);
            } else {
                log("All target files are up-to-date.",
                    Project.MSG_VERBOSE);
            }
        }
    }

    /**
     * Scan a directory for files to check for "up to date"ness
     * @param srcDir the directory
     * @param files the files to scan for
     * @return true if the files are up to date
     */
    protected boolean scanDir(File srcDir, String[] files) {
        SourceFileScanner sfs = new SourceFileScanner(this);
        FileNameMapper mapper = getMapper();
        File dir = srcDir;
        if (mapperElement == null) {
            dir = null;
        }
        return sfs.restrict(files, srcDir, dir, mapper).length == 0;
    }

    private FileNameMapper getMapper() {
        FileNameMapper mapper = null;
        if (mapperElement == null) {
            MergingMapper mm = new MergingMapper();
            mm.setTo(targetFile.getAbsolutePath());
            mapper = mm;
        } else {
            mapper = mapperElement.getImplementation();
        }
        return mapper;
    }
}

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