Removing DestFIle, DestDir, SrcFile, SrcDir, ValidatedFileAttribute and PreferredAttribute.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@270489 13f79535-47bb-0310-9956-ffa450edef68
24 years ago · 6e6abf78f4
--- a/src/main/org/apache/tools/ant/types/DestDir.java
+++ b/src/main/org/apache/tools/ant/types/DestDir.java
@@ -1,119 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 import java.io.File;
 import org.apache.tools.ant.BuildException;
 /**
 * This wrapper class is used to represent Destination Directories.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public final class DestDir extends ValidatedFileAttribute {
    private String message = null;
    /**
     * empty constructor
     */
    public DestDir() {}
     /**
     * file constructor; performs validation
     * @param file the file to use
     */
    public DestDir(File file) throws BuildException {
        setFile(file);
    }
    protected final String getMessage() {
        return message;
    }
    /**
     * @return false if DestDir is null or if DestDir exists, but
     * is not a directory.  Return true, otherwise.
     */
    protected final boolean isValid() {
        File f = getFile();
        if (f == null) {
            message = "DestDir must not be null";
            return false;
        }
        if (f.exists() && !f.isDirectory()) {
            message = f + " is not a directory.";
            return false;
        }
        //If DestDir does not exist, make sure it is well formed.
        if (!f.exists()) {
            File tmp = f;
            while (tmp.getParent() != null) {
                File parent = new File(tmp.getParent());
                if (parent.exists()) {
                    if (!parent.isDirectory()) {
                        message = f + " contains the path "
                                  + parent + " that is not a directory.";
                        return false;
                    }
                    break;
                }
                tmp = parent;
            }
        }
        return true;
    }
 }
--- a/src/main/org/apache/tools/ant/types/DestFile.java
+++ b/src/main/org/apache/tools/ant/types/DestFile.java
@@ -1,144 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 import java.io.File;
 import org.apache.tools.ant.BuildException;
 /**
 * This wrapper class is used to represent Destination Files.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public final class DestFile extends ValidatedFileAttribute {
    private String message;
    /**
     * empty constructor
     */
    public DestFile() {}
     /**
     * file constructor; performs validation
     * @param file the file to use
     */
    public DestFile(File file) throws BuildException {
        setFile(file);
    }
    protected final String getMessage() {
        return message;
    }
    /**
     * @return false if DestFile is null or if DestFile exists, but
     * is not a file.  Return true, otherwise.
     */
    protected final boolean isValid() {
        File f = getFile();
        if (f == null) {
            message = "DestFile must not be null";
            return false;
        }
        if (f.exists() && !f.isFile()) {
            message = f + " is not a file.";
            return false;
        }
        //If DestFile does not exist, make sure it is well formed.
        if (!f.exists()) {
            File tmp = f;
            while (tmp.getParent() != null) {
                File parent = new File(tmp.getParent());
                if (parent.exists()) {
                    if (!parent.isDirectory()) {
                        message = f + " contains the path "
                                  + parent + " that is not a directory.";
                        return false;
                    }
                    break;
                }
                tmp = parent;
            }
        }
        return true;
    }
    /**
     * test for the dest file being newer than the file passed in.
     * returns true iff the dest exists and is the same age or newer
     * @pre getFile()!=null && dependent!=null
     * @param dependent file we are dependent on
     * @return true iff we are up to date
     */
    public boolean isUpToDate(File dependent) {
      if(!getFile().exists())
          return false;
      return getFile().lastModified() >= dependent.lastModified();
    }
    /**
     * test for the dest file being newer than the SrcFile passed in.
     * returns true iff the dest exists and is the same age or newer
     * @pre getFile()!=null
     * @pre dependent!=null && depedent.getFile!=null;
     * @param dependent file we are dependent on
     * @return true iff we are up to date
     */
     public boolean isUpToDate(SrcFile dependent) {
        return isUpToDate(dependent.getFile());
    }
 }
--- a/src/main/org/apache/tools/ant/types/PreferredAttribute.java
+++ b/src/main/org/apache/tools/ant/types/PreferredAttribute.java
@@ -1,65 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 /**
 * IntrospectionHelper attaches higer priority to PreferredAttribute
 * objects when compared to other objects.  This prioritization
 * is used when there are multiple overridden Setter Methods.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public interface PreferredAttribute {
 }
--- a/src/main/org/apache/tools/ant/types/SrcDir.java
+++ b/src/main/org/apache/tools/ant/types/SrcDir.java
@@ -1,107 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 import java.io.File;
 import org.apache.tools.ant.BuildException;
 /**
 * This wrapper class is used to represent Source(Origin) Directories.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public final class SrcDir extends ValidatedFileAttribute {
    /**
     * empty constructor
     */
    public SrcDir() {}
     /**
     * file constructor; performs validation
     * @param file the file to use
     */
    public SrcDir(File file) throws BuildException {
        setFile(file);
    }
    private String message;
    protected final String getMessage() {
        return message;
    }
    /**
     * @return false if SrcDir is null or if SrcDir does not exist
     * or if SrcDir is not a directory. Return true, otherwise.
     */
    protected final boolean isValid() {
        File f = getFile();
        if (f == null) {
            message = "SrcDir must not be null";
            return false;
        }
        if (!f.exists()) {
            message = f + " does not exist.";
            return false;
        }
        if (!f.isDirectory()) {
            message = f + " is not a directory.";
            return false;
        }
        return true;
    }
 }
--- a/src/main/org/apache/tools/ant/types/SrcFile.java
+++ b/src/main/org/apache/tools/ant/types/SrcFile.java
@@ -1,107 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 import java.io.File;
 import org.apache.tools.ant.BuildException;
 /**
 * This wrapper class is used to represent Source(Origin) Files.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public final class SrcFile extends ValidatedFileAttribute {
    /**
     * empty constructor
     */
    public SrcFile() {}
     /**
     * file constructor; performs validation
     * @param file the file to use
     */
    public SrcFile(File file) throws BuildException {
        setFile(file);
    }
    private String message;
    protected final String getMessage() {
        return message;
    }
    /**
     * @return false if SrcFile is null or if SrcFile does not exist
     * or if SrcFile is not a file. Return true, otherwise.
     */
    protected final boolean isValid() {
        File f = getFile();
        if (f == null) {
            message = "SrcFile must not be null";
            return false;
        }
        if (!f.exists()) {
            message = f + " does not exist.";
            return false;
        }
        if (!f.isFile()) {
            message = f + " is not a file.";
            return false;
        }
        return true;
    }
 }
--- a/src/main/org/apache/tools/ant/types/ValidatedFileAttribute.java
+++ b/src/main/org/apache/tools/ant/types/ValidatedFileAttribute.java
@@ -1,117 +0,0 @@
 /*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  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. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Ant", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
 package org.apache.tools.ant.types;
 import java.io.File;
 import org.apache.tools.ant.BuildException;
 /**
 * Wrapper class that can be extended to perform file type
 * validation.
 *
 * Possible implementations may be SrcFile, SrcDir, DestFile,
 * DestDir, JavaSrcFile, ReadableSrcFile, etc.
 *
 * The idea is to validate the attribute right when it is being
 * set instead of performing the check later on.  This will
 * remove redundant code as well as minimize the headache
 * of writing validation code for the BuildWriter.
 *
 * @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
 */
 public abstract class ValidatedFileAttribute implements PreferredAttribute {
    private File file = null;
    /**
     * The implementing class must provide the message that
     * is to be displayed if the file is not valid.
     *
     * @return the String message that is to be displayed
     * if the file is not valid.
     */
    protected abstract String getMessage();
    /**
     * Is the file a valid file based on the context?
     * This decision must be made by the subclass's
     * implementation of this method.
     *
     * @return true or false depending upon the
     * validity of the file.
     */
    protected abstract boolean isValid();
    public ValidatedFileAttribute() {
    }
    /**
     * Retrieves the file.
     */
    public final File getFile() {
        return file;
    }
    /**
     * Invoked by {@link org.apache.tools.ant.IntrospectionHelper IntrospectionHelper}.
     */
    public final void setFile(File f) throws BuildException {
        file = f;
        if (!isValid()) {
            file = null;
            throw new BuildException(getMessage());
        }
    }
 }