/*
* Copyright 2001-2002,2004 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.taskdefs;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Project;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.filters.util.ChainReaderHelper;
import org.apache.tools.ant.types.FilterChain;
/**
* Load a file into a property
*
* @author Steve Loughran
* @author Magesh Umasankar
* @since Ant 1.5
* @ant.task category="utility"
*/
public final class LoadFile extends Task {
/**
* source file, usually null
*/
private File srcFile = null;
/**
* what to do when it goes pear-shaped
*/
private boolean failOnError = true;
/**
* Encoding to use for filenames, defaults to the platform's default
* encoding.
*/
private String encoding = null;
/**
* name of property
*/
private String property = null;
/**
* Holds FilterChains
*/
private final Vector filterChains = new Vector();
/**
* Encoding to use for input, defaults to the platform's default
* encoding. <p>
*
* For a list of possible values see
* <a href="http://java.sun.com/products/jdk/1.2/docs/guide/internat/encoding.doc.html">
* http://java.sun.com/products/jdk/1.2/docs/guide/internat/encoding.doc.html
* </a>.</p>
*
* @param encoding The new Encoding value
*/
public final void setEncoding(final String encoding) {
this.encoding = encoding;
}
/**
* Property name to save to.
*
* @param property The new Property value
*/
public final void setProperty(final String property) {
this.property = property;
}
/**
* Sets the file to load.
*
* @param srcFile The new SrcFile value
*/
public final void setSrcFile(final File srcFile) {
this.srcFile = srcFile;
}
/**
* If true, fail on load error.
*
* @param fail The new Failonerror value
*/
public final void setFailonerror(final boolean fail) {
failOnError = fail;
}
/**
* read in a source file to a property
*
* @exception BuildException if something goes wrong with the build
*/
public final void execute()
throws BuildException {
//validation
if (srcFile == null) {
throw new BuildException("source file not defined");
}
if (property == null) {
throw new BuildException("output property not defined");
}
FileInputStream fis = null;
BufferedInputStream bis = null;
Reader instream = null;
log("loading " + srcFile + " into property " + property,
Project.MSG_VERBOSE);
try {
final long len = srcFile.length();
log("file size = " + len, Project.MSG_DEBUG);
//discard most of really big files
final int size = (int) len;
//open up the file
fis = new FileInputStream(srcFile);
bis = new BufferedInputStream(fis);
if (encoding == null) {
instream = new InputStreamReader(bis);
} else {
instream = new InputStreamReader(bis, encoding);
}
String text = "";
if (size != 0) {
ChainReaderHelper crh = new ChainReaderHelper();
crh.setBufferSize(size);
crh.setPrimaryReader(instream);
crh.setFilterChains(filterChains);
crh.setProject(getProject());
instream = crh.getAssembledReader();
text = crh.readFully(instream);
}
if (text != null) {
if (text.length() > 0) {
getProject().setNewProperty(property, text);
log("loaded " + text.length() + " characters",
Project.MSG_VERBOSE);
log(property + " := " + text, Project.MSG_DEBUG);
}
}
} catch (final IOException ioe) {
final String message = "Unable to load file: " + ioe.toString();
if (failOnError) {
throw new BuildException(message, ioe, getLocation());
} else {
log(message, Project.MSG_ERR);
}
} catch (final BuildException be) {
if (failOnError) {
throw be;
} else {
log(be.getMessage(), Project.MSG_ERR);
}
} finally {
try {
if (fis != null) {
fis.close();
}
} catch (IOException ioex) {
//ignore
}
}
}
/**
* Add the FilterChain element.
*/
public final void addFilterChain(FilterChain filter) {
filterChains.addElement(filter);
}
//end class
}