org.primefaces.expression.impl.PreviousExpressionResolver Maven / Gradle / Ivy

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/*
 * Copyright 2009-2014 PrimeTek.
 *
 * 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.primefaces.expression.impl;

import java.util.List;

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;

import org.primefaces.expression.SearchExpressionResolver;

/**
 * {@link SearchExpressionResolver} for the "@previous" keyword.
 */
public class PreviousExpressionResolver implements SearchExpressionResolver {

    public UIComponent resolveComponent(FacesContext context, UIComponent source, UIComponent last, String expression, int options) {
        UIComponent parent = last.getParent();

        if (parent.getChildCount() > 1) {
            List children = parent.getChildren();
            int index = children.indexOf(last);

            if (index > 0) {
                int nextIndex = -1;
                do {
                    index--;
                    
                    String className = children.get(index).getClass().getName();
                    if (!className.contains("UIInstructions") && !className.contains("UILeaf")) {
                        nextIndex = index;
                    }
                } while (nextIndex == -1 && index > 0);

                if (nextIndex != -1) {
                    return children.get(nextIndex);
                }
            }
        }

        return null;
    }

}