/*
 * 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.cocoon.forms.binding;

import org.apache.cocoon.forms.formmodel.Widget;

import org.apache.commons.jxpath.JXPathContext;

/**
 * SetAttributeJXPathBinding provides an implementation of a {@link Binding}
 * that sets a particular attribute to a fixed value upon save.
 * <p>
 * NOTES: <ol>
 * <li>This Binding does not perform any actions when loading.</li>
 * </ol>
 *
 * @version $Id$
 */
public class SetAttributeJXPathBinding extends JXPathBindingBase {

    private final String name;
    private final String value;


    /**
     * Constructs SetAttributeJXPathBinding
     */
    public SetAttributeJXPathBinding(JXPathBindingBuilderBase.CommonAttributes commonAtts,
                                     String attName,
                                     String attValue) {
        super(commonAtts);
        this.name = attName;
        this.value = attValue;
    }

    public String getId() { return name; }
    public String getValue() { return value; }

    /**
     * Do-Nothing implementation.
     */
    public void doLoad(Widget frmModel, JXPathContext jxpc) {
        //this does nothing in the loading of things
    }

    /**
     * Sets the attribute value on the passed JXPathContext
     */
    public void doSave(Widget frmModel, JXPathContext jxpc) {
        jxpc.setValue("@" + this.name, this.value);
        if (getLogger().isDebugEnabled()) {
            getLogger().debug("done saving " + this);
        }
    }

    public String toString() {
        return "SetAttributeJXPathBinding [attName=" + this.name + ", attValue=" + this.value + "]";
    }
}