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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.condition;
import java.io.IOException;
import java.util.Iterator;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.types.Resource;
import org.apache.tools.ant.types.ResourceCollection;
import org.apache.tools.ant.types.resources.Union;
import org.apache.tools.ant.util.ResourceUtils;
/**
* Compares resources for equality based on size and content.
* All resources specified must match; no resource collections
* specified is an error condition; if resource collections are
* specified, but yield fewer than two elements, the condition
* evaluates to <code>true</code>.
* @since Ant 1.7
*/
public class ResourcesMatch implements Condition {
private Union resources = null;
private boolean asText = false;
/**
* Set whether to treat resources as if they were text files,
* ignoring line endings.
* @param asText whether to ignore line endings.
*/
public void setAsText(boolean asText) {
this.asText = asText;
}
/**
* Add a resource collection.
* @param rc the resource collection to add.
*/
public void add(ResourceCollection rc) {
if (rc == null) {
return;
}
resources = resources == null ? new Union() : resources;
resources.add(rc);
}
/**
* Verify that all resources match.
* @return true if all resources are equal.
* @exception BuildException if there is an error.
*/
public boolean eval() throws BuildException {
if (resources == null) {
throw new BuildException(
"You must specify one or more nested resource collections");
}
if (resources.size() > 1) {
Iterator<Resource> i = resources.iterator();
Resource r1 = (Resource) i.next();
Resource r2 = null;
while (i.hasNext()) {
r2 = (Resource) i.next();
try {
if (!ResourceUtils.contentEquals(r1, r2, asText)) {
return false;
}
} catch (IOException ioe) {
throw new BuildException("when comparing resources "
+ r1.toString() + " and " + r2.toString(), ioe);
}
r1 = r2;
}
}
return true;
}
}
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