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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;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.taskdefs.condition.Condition;
import org.apache.tools.ant.types.Comparison;
import org.apache.tools.ant.types.Reference;
import org.apache.tools.ant.types.ResourceCollection;
/**
* Count resources from a ResourceCollection, storing to a property or
* writing to the log. Can also be used as a Condition.
* @since Ant 1.7
*/
public class ResourceCount extends Task implements Condition {
private static final String ONE_NESTED_MESSAGE
= "ResourceCount can count resources from exactly one nested ResourceCollection.";
private static final String COUNT_REQUIRED
= "Use of the ResourceCount condition requires that the count attribute be set.";
private ResourceCollection rc;
private Comparison when = Comparison.EQUAL;
private Integer count;
private String property;
/**
* Add the ResourceCollection to count.
* @param r the ResourceCollection to count.
* @throws BuildException if already set.
*/
public void add(ResourceCollection r) {
if (rc != null) {
throw new BuildException(ONE_NESTED_MESSAGE);
}
rc = r;
}
/**
* Set the ResourceCollection reference.
* @param r the Reference.
*/
public void setRefid(Reference r) {
Object o = r.getReferencedObject();
if (!(o instanceof ResourceCollection)) {
throw new BuildException(r.getRefId()
+ " doesn\'t denote a ResourceCollection");
}
add((ResourceCollection) o);
}
/**
* Execute as a Task.
*/
public void execute() {
if (rc == null) {
throw new BuildException(ONE_NESTED_MESSAGE);
}
if (property == null) {
log("resource count = " + rc.size());
} else {
getProject().setNewProperty(property, Integer.toString(rc.size()));
}
}
/**
* Fulfill the condition contract.
* @return true if the specified ResourceCollection satisfies the set criteria.
* @throws BuildException if an error occurs.
*/
public boolean eval() {
if (rc == null) {
throw new BuildException(ONE_NESTED_MESSAGE);
}
if (count == null) {
throw new BuildException(COUNT_REQUIRED);
}
return when.evaluate(new Integer(rc.size()).compareTo(count));
}
/**
* Set the target count number for use as a Condition.
* @param c number of Resources as int.
*/
public void setCount(int c) {
count = new Integer(c);
}
/**
* Set the comparison for use as a Condition.
* @param c Comparison (an EnumeratedAttribute) When.
* @see org.apache.tools.ant.types.Comparison
*/
public void setWhen(Comparison c) {
when = c;
}
/**
* Set the name of the property to set in task mode.
* @param p the property name to set.
*/
public void setProperty(String p) {
property = p;
}
}
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