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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.
*/
/* $Id$ */
package org.apache.fop.check;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* A factory class for creating checks that belong to a same family.
* @param <C> a family of checks
*/
public abstract class ChecksFactory<C extends Check> {
/**
* A factory to create a particular kind of check.
*/
protected static interface CheckFactory<C> {
/**
* Creates a {@link Check} instance from the given XML element.
*
* @param element an element representing a check
* @return the corresponding check
*/
C createCheck(Element element);
}
private final Map<String, CheckFactory<C>> checkFactories
= new HashMap<String, CheckFactory<C>>();
/** Default constructor. */
protected ChecksFactory() { }
/**
* Registers a factory for a new kind of check.
*
* @param elementName the name of the element under which the check is identified in
* the XML test case
* @param factory the corresponding factory
*/
protected void registerCheckFactory(String elementName, CheckFactory<C> factory) {
checkFactories.put(elementName, factory);
}
/**
* Creates a new {@link Check} instance corresponding to the given element.
*
* @param element an element in the XML test case that identifies a particular check
* @return the corresponding check
* @throws IllegalArgumentException if not check corresponding to the given element
* has been found
*/
public final C createCheck(Element element) {
String name = element.getTagName();
CheckFactory<C> factory = checkFactories.get(name);
if (factory == null) {
throw new IllegalArgumentException("No check class found for " + name);
} else {
return factory.createCheck(element);
}
}
public final List<C> createCheckList(Element container) {
List<C> checks = new ArrayList<C>();
NodeList nodes = container.getChildNodes();
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (node instanceof Element) {
checks.add(createCheck((Element) node));
}
}
return checks;
}
}
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