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/*
* 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) {
// 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) {
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));
}
}
}
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