- /*
- * Copyright 2003-2004 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.filters;
-
- import java.io.IOException;
- import java.io.Reader;
- import java.io.File;
- import java.io.BufferedReader;
- import java.io.FileReader;
- import org.apache.tools.ant.types.Parameter;
-
- /**
- * Concats a file before and/or after the file.
- *
- * <p>Example:<pre>
- * <copy todir="build">
- * <fileset dir="src" includes="*.java"/>
- * <filterchain>
- * <concatfilter prepend="apache-license-java.txt"/>
- * </filterchain>
- * </copy>
- * </pre>
- * 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
- */
- 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) {
- // donīt 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) {
- 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
- 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));
- }
- }
- }