/*
 * Copyright 2004-2009 the Seasar Foundation and the Others.
 *
 * 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.seasar.mayaa.impl.builder.injection;

import org.seasar.mayaa.builder.injection.InjectionChain;
import org.seasar.mayaa.builder.injection.InjectionResolver;
import org.seasar.mayaa.engine.specification.NodeAttribute;
import org.seasar.mayaa.engine.specification.QName;
import org.seasar.mayaa.engine.specification.SpecificationNode;
import org.seasar.mayaa.impl.CONST_IMPL;
import org.seasar.mayaa.impl.ParameterAwareImpl;
import org.seasar.mayaa.impl.builder.BuilderUtil;
import org.seasar.mayaa.impl.engine.specification.SpecificationUtil;
import org.seasar.mayaa.impl.util.ObjectUtil;

/**
 * テンプレートにm:rendered="false"が指定されている場合、m:nullと見なす。
 *
 * @author Masataka Kurihara (Gluegent, Inc.)
 */
public class RenderedSetter extends ParameterAwareImpl
        implements InjectionResolver, CONST_IMPL {

    private static final long serialVersionUID = 1350199548908128291L;
    protected static final QName QM_NULL =
        SpecificationUtil.createQName("null");
    protected static final QName QM_RENDERED =
        SpecificationUtil.createQName("rendered");

    protected boolean isRendered(SpecificationNode node) {
        if (node == null) {
            throw new IllegalArgumentException();
        }
        NodeAttribute attr = node.getAttribute(QM_RENDERED);
        if (attr != null) {
            return ObjectUtil.booleanValue(attr.getValue(), true);
        }
        return true;
    }

    public SpecificationNode getNode(
            SpecificationNode original, InjectionChain chain) {
        if (original == null || chain == null) {
            throw new IllegalArgumentException();
        }
        SpecificationNode injected = chain.getNode(original);
        if (injected == null) {
            return null;
        }
        if (isRendered(original) == false || isRendered(injected) == false) {
                return BuilderUtil.createInjectedNode(
                        QM_NULL, null, original, false);
        }
        return injected;
    }

}
