/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 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.filters.util;
import org.apache.tools.ant.AntClassLoader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.filters.BaseFilterReader;
import org.apache.tools.ant.filters.ChainableReader;
import org.apache.tools.ant.types.AntFilterReader;
import org.apache.tools.ant.types.FilterChain;
import org.apache.tools.ant.types.Path;
import org.apache.tools.ant.types.Parameter;
import org.apache.tools.ant.types.Parameterizable;
import org.apache.tools.ant.util.FileUtils;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.io.FilterReader;
import java.io.Reader;
import java.io.IOException;
import java.util.Vector;
/**
* Process a FilterReader chain.
*
* @author <a href="mailto:umagesh@apache.org">Magesh Umasankar</a>
*/
public final class ChainReaderHelper {
/**
* The primary reader to which the reader chain is to be attached.
*/
public Reader primaryReader;
/**
* The size of the buffer to be used.
*/
public int bufferSize = 8192;
/**
* Chain of filters
*/
public Vector filterChains = new Vector();
/** The Ant project */
private Project project = null;
/**
* Sets the primary reader
*/
public final void setPrimaryReader(Reader rdr) {
primaryReader = rdr;
}
/**
* Set the project to work with
*/
public final void setProject(final Project project) {
this.project = project;
}
/**
* Get the project
*/
public final Project getProject() {
return project;
}
/**
* Sets the buffer size to be used. Defaults to 4096,
* if this method is not invoked.
*/
public final void setBufferSize(int size) {
bufferSize = size;
}
/**
* Sets the collection of filter reader sets
*/
public final void setFilterChains(Vector fchain) {
filterChains = fchain;
}
/**
* Assemble the reader
*/
public final Reader getAssembledReader() throws BuildException {
if (primaryReader == null) {
throw new BuildException("primaryReader must not be null.");
}
Reader instream = primaryReader;
final int filterReadersCount = filterChains.size();
final Vector finalFilters = new Vector();
for (int i = 0; i < filterReadersCount; i++) {
final FilterChain filterchain =
(FilterChain) filterChains.elementAt(i);
final Vector filterReaders = filterchain.getFilterReaders();
final int readerCount = filterReaders.size();
for (int j = 0; j < readerCount; j++) {
finalFilters.addElement(filterReaders.elementAt(j));
}
}
final int filtersCount = finalFilters.size();
if (filtersCount > 0) {
for (int i = 0; i < filtersCount; i++) {
Object o = finalFilters.elementAt(i);
if (o instanceof AntFilterReader) {
final AntFilterReader filter = (AntFilterReader) finalFilters.elementAt(i);
final String className = filter.getClassName();
final Path classpath = filter.getClasspath();
final Project project = filter.getProject();
if (className != null) {
try {
Class clazz = null;
if (classpath == null) {
clazz = Class.forName(className);
} else {
AntClassLoader al = new AntClassLoader(project,
classpath);
clazz = al.loadClass(className);
AntClassLoader.initializeClass(clazz);
}
if (clazz != null) {
if (!FilterReader.class.isAssignableFrom(clazz)) {
throw new BuildException(className +
" does not extend java.io.FilterReader");
}
final Constructor[] constructors =
clazz.getConstructors();
int j = 0;
for (; j < constructors.length; j++) {
Class[] types = constructors[j]
.getParameterTypes();
if (types.length == 1 &&
types[0].isAssignableFrom(Reader.class)) {
break;
}
}
final Reader[] rdr = {instream};
instream =
(Reader) constructors[j].newInstance(rdr);
if (Parameterizable.class.isAssignableFrom(clazz)) {
final Parameter[] params = filter.getParams();
((Parameterizable)
instream).setParameters(params);
}
}
} catch (final ClassNotFoundException cnfe) {
throw new BuildException(cnfe);
} catch (final InstantiationException ie) {
throw new BuildException(ie);
} catch (final IllegalAccessException iae) {
throw new BuildException(iae);
} catch (final InvocationTargetException ite) {
throw new BuildException(ite);
}
}
} else if (o instanceof ChainableReader &&
o instanceof Reader) {
if (project != null && o instanceof BaseFilterReader) {
((BaseFilterReader) o).setProject(project);
}
instream = ((ChainableReader) o).chain(instream);
}
}
}
return instream;
}
/**
* Read data from the reader and return the
* contents as a string.
*/
public final String readFully(Reader rdr)
throws IOException {
return FileUtils.readFully(rdr, bufferSize);
}
}