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Groovy example source code file (FilteredAttributes.java)

This example Groovy source code file (FilteredAttributes.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

attributes, closure, closure, filteredattributes, filteredattributes, gpathresult, iterator, iterator, map, object, object, string, util

The Groovy FilteredAttributes.java source code

/*
 * Copyright 2003-2010 the original author or authors.
 *
 * 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 groovy.util.slurpersupport;

import java.util.Iterator;
import java.util.Map;

import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import groovy.lang.Closure;

/**
 * Lazy evaluated representation of a node's attributes filtered by a Closure.
 *
 * @author John Wilson
 */
public class FilteredAttributes extends Attributes
{
    private final Closure closure;

    /**
     * @param parent the GPathResult prior to the application of the expression creating this GPathResult
     * @param closure the Closure to use to filter the attributes
     * @param namespaceTagHints the known tag to namespace mappings
     */
    public FilteredAttributes(final GPathResult parent, final Closure closure, final Map<String, String> namespaceTagHints) {
        super(parent, parent.name, namespaceTagHints);
        this.closure = closure;
    }

    public Iterator nodeIterator() {
        return new NodeIterator(this.parent.iterator())
        {
            protected Object getNextNode(final Iterator iter) {
                while (iter.hasNext()) {
                    final Object node = iter.next();
                    if (DefaultTypeTransformation.castToBoolean(FilteredAttributes.this.closure.call(new Object[]{node}))) {
                        return node;
                    }
                }
                return null;
            }
        };
    }

}

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