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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/ConcatFilter.java')
| -rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/ConcatFilter.java | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/ConcatFilter.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/ConcatFilter.java new file mode 100644 index 00000000..0ac6024b --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/filters/ConcatFilter.java @@ -0,0 +1,218 @@ +/* + * 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.filters; + +import java.io.BufferedReader; +import java.io.File; +import java.io.FileReader; +import java.io.IOException; +import java.io.Reader; + +import org.apache.tools.ant.types.Parameter; + +/** + * Concats a file before and/or after the file. + * + * <p>Example:</p><pre> + * <copy todir="build"> + * <fileset dir="src" includes="*.java"/> + * <filterchain> + * <concatfilter prepend="apache-license-java.txt"/> + * </filterchain> + * </copy> + * </pre> + * + * <p>Copies all java sources from <i>src</i> to <i>build</i> and adds the + * content of <i>apache-license-java.txt</i> add the beginning of each + * file.</p> + * + * @since 1.6 + * @version 2003-09-23 + */ +public final class ConcatFilter extends BaseParamFilterReader + implements ChainableReader { + + /** File to add before the content. */ + private File prepend; + + /** File to add after the content. */ + private File append; + + /** Reader for prepend-file. */ + private Reader prependReader = null; + + /** Reader for append-file. */ + private Reader appendReader = null; + + /** + * Constructor for "dummy" instances. + * + * @see BaseFilterReader#BaseFilterReader() + */ + public ConcatFilter() { + super(); + } + + /** + * Creates a new filtered reader. + * + * @param in A Reader object providing the underlying stream. + * Must not be <code>null</code>. + */ + public ConcatFilter(final Reader in) { + super(in); + } + + /** + * Returns the next character in the filtered stream. If the desired + * number of lines have already been read, the resulting stream is + * effectively at an end. Otherwise, the next character from the + * underlying stream is read and returned. + * + * @return the next character in the resulting stream, or -1 + * if the end of the resulting stream has been reached + * + * @exception IOException if the underlying stream throws an IOException + * during reading + */ + @Override + public int read() throws IOException { + // do the "singleton" initialization + if (!getInitialized()) { + initialize(); + setInitialized(true); + } + + int ch = -1; + + // The readers return -1 if they end. So simply read the "prepend" + // after that the "content" and at the end the "append" file. + if (prependReader != null) { + ch = prependReader.read(); + if (ch == -1) { + // I am the only one so I have to close the reader + prependReader.close(); + prependReader = null; + } + } + if (ch == -1) { + ch = super.read(); + } + if (ch == -1) { + // don't call super.close() because that reader is used + // on other places ... + if (appendReader != null) { + ch = appendReader.read(); + if (ch == -1) { + // I am the only one so I have to close the reader + appendReader.close(); + appendReader = null; + } + } + } + + return ch; + } + + /** + * Sets <i>prepend</i> attribute. + * @param prepend new value + */ + public void setPrepend(final File prepend) { + this.prepend = prepend; + } + + /** + * Returns <i>prepend</i> attribute. + * @return prepend attribute + */ + public File getPrepend() { + return prepend; + } + + /** + * Sets <i>append</i> attribute. + * @param append new value + */ + public void setAppend(final File append) { + this.append = append; + } + + /** + * Returns <i>append</i> attribute. + * @return append attribute + */ + public File getAppend() { + return append; + } + + /** + * Creates a new ConcatReader using the passed in + * Reader for instantiation. + * + * @param rdr A Reader object providing the underlying stream. + * Must not be <code>null</code>. + * + * @return a new filter based on this configuration, but filtering + * the specified reader + */ + public Reader chain(final Reader rdr) { + final ConcatFilter newFilter = new ConcatFilter(rdr); + newFilter.setPrepend(getPrepend()); + newFilter.setAppend(getAppend()); + // Usually the initialized is set to true. But here it must not. + // Because the prepend and append readers have to be instantiated + // on runtime + //newFilter.setInitialized(true); + return newFilter; + } + + /** + * Scans the parameters list for the "lines" parameter and uses + * it to set the number of lines to be returned in the filtered stream. + * also scan for skip parameter. + */ + private void initialize() throws IOException { + // get parameters + final Parameter[] params = getParameters(); + if (params != null) { + for (int i = 0; i < params.length; i++) { + if ("prepend".equals(params[i].getName())) { + setPrepend(new File(params[i].getValue())); + continue; + } + if ("append".equals(params[i].getName())) { + setAppend(new File(params[i].getValue())); + continue; + } + } + } + if (prepend != null) { + if (!prepend.isAbsolute()) { + prepend = new File(getProject().getBaseDir(), prepend.getPath()); + } + prependReader = new BufferedReader(new FileReader(prepend)); + } + if (append != null) { + if (!append.isAbsolute()) { + append = new File(getProject().getBaseDir(), append.getPath()); + } + appendReader = new BufferedReader(new FileReader(append)); + } + } +} |