New mapper - <filtermapper>.

This is a filterchain applied to the source file names of the filenamemapper#mapFileName
function.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@277237 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/types/FilterChain.java

@@ -40,7 +40,7 @@ import org.apache.tools.ant.filters.TokenFilter;
  * FilterChain may contain a chained set of filter readers.
  *
  */
-public final class FilterChain extends DataType
+public class FilterChain extends DataType
     implements Cloneable {
 
     private Vector filterReaders = new Vector();

src/main/org/apache/tools/ant/types/defaults.properties

@@ -18,6 +18,7 @@ packagemapper=org.apache.tools.ant.util.PackageNameMapper
 unpackagemapper=org.apache.tools.ant.util.UnPackageNameMapper
 compositemapper=org.apache.tools.ant.util.CompositeMapper
 chainedmapper=org.apache.tools.ant.util.ChainedMapper
+filtermapper=org.apache.tools.ant.types.mappers.FilterMapper
 
 path=org.apache.tools.ant.types.Path
 patternset=org.apache.tools.ant.types.PatternSet

src/main/org/apache/tools/ant/types/mappers/FilterMapper.java

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2004 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 org.apache.tools.ant.types.mappers;
+
+import java.io.StringReader;
+import java.io.Reader;
+
+import java.util.Vector;
+
+import org.apache.tools.ant.BuildException;
+import org.apache.tools.ant.UnsupportedAttributeException;
+import org.apache.tools.ant.filters.util.ChainReaderHelper;
+import org.apache.tools.ant.types.FilterChain;
+import org.apache.tools.ant.util.FileNameMapper;
+import org.apache.tools.ant.util.FileUtils;
+
+/**
+ * This is a filenamemaper based on a FilterChain.
+ */
+public class FilterMapper extends FilterChain implements FileNameMapper {
+    /**
+     * From attribute not supported.
+     * @param from a string
+     * @throws BuildException always
+     */
+    public void setFrom(String from) {
+        throw new UnsupportedAttributeException(
+            "filtermapper does'nt support the \"from\" attribute.", "from");
+    }
+
+    /**
+     * From attribute not supported.
+     * @param to a string
+     * @throws BuildException always
+     */
+    public void setTo(String to) {
+        throw new UnsupportedAttributeException(
+            "filtermapper does'nt support the \"to\" attribute.", "to");
+    }
+
+    /**
+     * Return the result of the filters on the sourcefilename.
+     * @param sourceFileName the filename to map
+     * @return  a one-element array of converted filenames, or null if
+     *          the filterchain returns an empty string.
+     */
+    public String[] mapFileName(String sourceFileName) {
+        try {
+            Reader stringReader = new StringReader(sourceFileName);
+            ChainReaderHelper helper = new ChainReaderHelper();
+            helper.setBufferSize(8192);
+            helper.setPrimaryReader(stringReader);
+            helper.setProject(getProject());
+            Vector filterChains = new Vector();
+            filterChains.add(this);
+            helper.setFilterChains(filterChains);
+            String result = FileUtils.readFully(helper.getAssembledReader());
+            if (result.length() == 0) {
+                return null;
+            } else {
+                return new String[] {result};
+            }
+        } catch (BuildException ex) {
+            throw ex;
+        } catch (Exception ex) {
+            throw new BuildException(ex);
+        }
+    }
+}