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/* |
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* Copyright 2005 The Apache Software Foundation |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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package org.apache.tools.ant.taskdefs; |
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import java.io.BufferedInputStream; |
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import java.io.IOException; |
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import java.io.InputStream; |
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import java.io.InputStreamReader; |
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import java.io.Reader; |
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import java.util.Vector; |
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import org.apache.tools.ant.BuildException; |
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import org.apache.tools.ant.Project; |
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import org.apache.tools.ant.Task; |
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import org.apache.tools.ant.filters.util.ChainReaderHelper; |
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import org.apache.tools.ant.types.FilterChain; |
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import org.apache.tools.ant.types.Resource; |
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import org.apache.tools.ant.types.ResourceCollection; |
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import org.apache.tools.ant.util.FileUtils; |
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/** |
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* Load a resource into a property |
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* |
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* @since Ant 1.7 |
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* @ant.task category="utility" |
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*/ |
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public class LoadResource extends Task { |
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/** |
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* The resource to load. |
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*/ |
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private Resource src; |
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/** |
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* what to do when it goes pear-shaped |
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*/ |
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private boolean failOnError = true; |
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/** |
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* Encoding to use for filenames, defaults to the platform's default |
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* encoding. |
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*/ |
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private String encoding = null; |
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/** |
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* name of property |
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*/ |
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private String property = null; |
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/** |
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* Holds FilterChains |
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*/ |
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private final Vector filterChains = new Vector(); |
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/** |
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* Encoding to use for input, defaults to the platform's default |
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* encoding. <p> |
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* |
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* For a list of possible values see |
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* <a href="http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html"> |
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* http://java.sun.com/j2se/1.5.0/docs/guide/intl/encoding.doc.html |
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* </a>.</p> |
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* |
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* @param encoding The new Encoding value |
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*/ |
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public final void setEncoding(final String encoding) { |
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this.encoding = encoding; |
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} |
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/** |
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* Property name to save to. |
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* |
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* @param property The new Property value |
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*/ |
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public final void setProperty(final String property) { |
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this.property = property; |
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} |
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/** |
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* If true, fail on load error. |
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* |
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* @param fail The new Failonerror value |
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*/ |
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public final void setFailonerror(final boolean fail) { |
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failOnError = fail; |
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} |
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/** |
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* read in a source file to a property |
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* |
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* @exception BuildException if something goes wrong with the build |
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*/ |
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public final void execute() |
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throws BuildException { |
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//validation |
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if (src == null) { |
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throw new BuildException("source resource not defined"); |
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} |
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if (property == null) { |
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throw new BuildException("output property not defined"); |
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} |
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InputStream is = null; |
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BufferedInputStream bis = null; |
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Reader instream = null; |
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log("loading " + src + " into property " + property, |
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Project.MSG_VERBOSE); |
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try { |
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final long len = src.getSize(); |
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log("resource size = " |
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+ (len != Resource.UNKNOWN_SIZE ? String.valueOf(len) |
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: "unknown"), Project.MSG_DEBUG); |
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//discard most of really big resources |
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final int size = (int) len; |
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//open up the resource |
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is = src.getInputStream(); |
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bis = new BufferedInputStream(is); |
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if (encoding == null) { |
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instream = new InputStreamReader(bis); |
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} else { |
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instream = new InputStreamReader(bis, encoding); |
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} |
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String text = ""; |
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if (size != 0) { |
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ChainReaderHelper crh = new ChainReaderHelper(); |
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if (len != Resource.UNKNOWN_SIZE) { |
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crh.setBufferSize(size); |
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} |
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crh.setPrimaryReader(instream); |
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crh.setFilterChains(filterChains); |
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crh.setProject(getProject()); |
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instream = crh.getAssembledReader(); |
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text = crh.readFully(instream); |
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} |
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if (text != null) { |
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if (text.length() > 0) { |
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getProject().setNewProperty(property, text); |
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log("loaded " + text.length() + " characters", |
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Project.MSG_VERBOSE); |
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log(property + " := " + text, Project.MSG_DEBUG); |
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} |
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} |
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} catch (final IOException ioe) { |
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final String message = "Unable to load resource: " |
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+ ioe.toString(); |
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if (failOnError) { |
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throw new BuildException(message, ioe, getLocation()); |
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} else { |
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log(message, Project.MSG_ERR); |
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} |
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} catch (final BuildException be) { |
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if (failOnError) { |
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throw be; |
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} else { |
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log(be.getMessage(), Project.MSG_ERR); |
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} |
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} finally { |
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FileUtils.close(is); |
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} |
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} |
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/** |
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* Add the FilterChain element. |
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* @param filter the filter to add |
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*/ |
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public final void addFilterChain(FilterChain filter) { |
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filterChains.addElement(filter); |
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} |
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/** |
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* Set the source resource. |
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* @param a the resource to load as a single element Resource collection. |
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*/ |
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public void addConfigured(ResourceCollection a) { |
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if (a.size() != 1) { |
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throw new BuildException("only single argument resource collections" |
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+ " are supported"); |
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} |
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src = (Resource) a.iterator().next(); |
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} |
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} |
Stefan Bodewig