optionrule.java

JAVA 文章管理系统源码

/*
 * Copyright 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.commons.betwixt.digester;

import org.apache.commons.betwixt.Descriptor;
import org.apache.commons.digester.Rule;
import org.xml.sax.Attributes;

/**
 * Maps option tree to an option in the 
 * {@link org.apache.commons.betwixt.Options}
 * on the current description.
 * @author <a href='http://jakarta.apache.org/'>Jakarta Commons Team</a>
 * @since 0.5
 */
public class OptionRule extends Rule {
    
    private String currentValue;
    private String currentName;
    
    /**
     * @see org.apache.commons.digester.Rule#begin(java.lang.String, java.lang.String, Attributes)
     */
    public void begin(String namespace, String name, Attributes attributes)
        throws Exception {
        currentValue = null;
        currentName = null;
    }



    /**
     * @see org.apache.commons.digester.Rule#end(java.lang.String, java.lang.String)
     */
    public void end(String namespace, String name) {
        if (currentName != null && currentValue != null) {
            Object top = getDigester().peek();
            if (top instanceof Descriptor) {
                Descriptor descriptor = (Descriptor) top;
                descriptor.getOptions().addOption(currentName, currentValue);
            }
        }
    }
    
    /**
     * Gets the rule that maps the <code>name</code> element
     * associated with the option
     * @return <code>Rule</code>, not null
     */
    public Rule getNameRule() {
        return new Rule() {
            public void body(String namespace, String name, String text) {
                currentName = text;
            }            
        };
    }

    /**
     * Gets the rule that maps the <code>value</code> element
     * associated with the option
     * @return <code>Rule</code>, not null
     */
    public Rule getValueRule() {
        return new Rule() {
            public void body(String namespace, String name, String text) {
                currentValue = text;
            }            
        };
    }
}