org.xlcloud.console.entitlements.nodes.EntitlementNode Maven / Gradle / Ivy

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/*
 * Copyright 2012 AMG.lab, a Bull Group Company
 * 
 * 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.xlcloud.console.entitlements.nodes;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Predicate;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;
import org.xlcloud.console.entitlements.CompositeEntitlementDictionary;
import org.xlcloud.console.entitlements.EntitlementDictionary;
import org.xlcloud.console.entitlements.nodes.predicates.EntitlementNodePredicate;

/**
 * Represents the single entitlement tree node.
 * Entitlement dictionaries are wrapped by this object.
 * @author "Konrad Król", AMG.net
 */
public class EntitlementNode extends DefaultTreeNode {
    
    private static final long serialVersionUID = -2172444051807728183L;

    /**
     * Instantiates new entitlement tree node
     *  and adds a node to the parent node.
     * @param entitlementDictionary entitlement dictionary which should be wrapped
     * @param visibilityPredicate indicates whether the entitlement node should be visible
     * @param selectionPredicate indicates whether the entitlement node should be selected by default
     * @param parent parent tree node
     */
    public EntitlementNode(EntitlementDictionary entitlementDictionary, EntitlementNodePredicate visibilityPredicate, EntitlementNodePredicate selectionPredicate, TreeNode parent) {
        super(entitlementDictionary, parent);
        
        if(entitlementDictionary instanceof CompositeEntitlementDictionary) {
            instantiateChildNodes((CompositeEntitlementDictionary) entitlementDictionary, visibilityPredicate, selectionPredicate);
        }
        
        if(this.isSelectable()) {
            this.initializeNodeSelection(entitlementDictionary, selectionPredicate);
        }
    }
    
    /**
     * Instantiates new entitlement tree node
     *  and adds a node to the parent node.
     * The tree node is unselected by default.
     * @param entitlementDictionary entitlement dicionary which should be wrapped
     * @param visibilityPredicate indicates whether the entitlement node should be visible
     * @param parent parent tree node
     */
    public EntitlementNode(EntitlementDictionary entitlementDictionary, EntitlementNodePredicate visibilityPredicate, TreeNode parent) {
        this(entitlementDictionary, visibilityPredicate, null, parent);
    }
    
    private void initializeNodeSelection(EntitlementDictionary entitlementDictionary, EntitlementNodePredicate selectionPredicate) {
        if(this.isLeaf()) {
            if(selectionPredicate != null) {
                this.setSelected(selectionPredicate.evaluate(entitlementDictionary));
            }
        } else {
            this.setSelected(hasAllChildrenSelected());
        }
    }
    
    private void instantiateChildNodes(CompositeEntitlementDictionary compositeDictionary, EntitlementNodePredicate visibilityPredicate, EntitlementNodePredicate selectionPredicate) {
        for(EntitlementDictionary child : compositeDictionary.getIncludedEntitlementDictionaries()) {
            if(visibilityPredicate.evaluate(child)) {
                new EntitlementNode(child, visibilityPredicate, selectionPredicate, this);
            }
        }
    }
    
    private boolean hasAllChildrenSelected() {
        if(this.isLeaf()) {
            return this.isSelected();
        } else {
            return forAllChildren(new Predicate() {
                @Override
                public boolean evaluate(Object object) {
                    return ((EntitlementNode) object).isSelected();
                }
            });
        }
    }
    
    private boolean forAllChildren(Predicate predicate) {
        return (CollectionUtils.countMatches(getChildren(), predicate) == getChildCount());
    }
}