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Groovy example source code file (NodeChild.java)

This example Groovy source code file (NodeChild.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

closure, gpathresult, gpathresult, io, iterator, iterator, map, node, nodechild, object, object, string, string, unsupportedoperationexception, util, writer

The Groovy NodeChild.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 groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.lang.GroovyRuntimeException;

import java.io.IOException;
import java.io.Writer;
import java.util.Iterator;
import java.util.Map;

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

/**
 * Lazy evaluated representation of a child node.
 *
 * @author John Wilson
 */
public class NodeChild extends GPathResult {
    private final Node node;

    /**
     * @param node a node
     * @param parent the GPathResult prior to the application of the expression creating this GPathResult
     * @param namespacePrefix the namespace prefix if any
     * @param namespaceTagHints the known tag to namespace mappings
     */
    public NodeChild(final Node node, final GPathResult parent, final String namespacePrefix, final Map<String, String> namespaceTagHints) {
        super(parent, node.name(), namespacePrefix, namespaceTagHints);
        this.node = node;
    }

    /**
     * @param node a node
     * @param parent the GPathResult prior to the application of the expression creating this GPathResult
     * @param namespaceTagHints the known tag to namespace mappings
     */
    public NodeChild(final Node node, final GPathResult parent, final Map<String, String> namespaceTagHints) {
        this(node, parent, "*", namespaceTagHints);
    }

    public int size() {
        return 1;
    }

    public String text() {
        return this.node.text();
    }

    public String namespaceURI() {
        return this.node.namespaceURI();
    }

    public GPathResult parents() {
        // TODO Auto-generated method stub
        throw new GroovyRuntimeException("parents() not implemented yet");
    }

    public Iterator iterator() {
        return new Iterator() {
            private boolean hasNext = true;

            public boolean hasNext() {
                return this.hasNext;
            }

            public Object next() {
                try {
                    return (this.hasNext) ? NodeChild.this : null;
                } finally {
                    this.hasNext = false;
                }
            }

            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }

    public Iterator nodeIterator() {
        return new Iterator() {
            private boolean hasNext = true;

            public boolean hasNext() {
                return this.hasNext;
            }

            public Object next() {
                try {
                    return (this.hasNext) ? NodeChild.this.node : null;
                } finally {
                    this.hasNext = false;
                }
            }

            public void remove() {
                throw new UnsupportedOperationException();
            }
        };
    }

    public Object getAt(final int index) {
        if (index == 0) {
            return node;
        } else {
            throw new ArrayIndexOutOfBoundsException(index);
        }
    }

    public Map attributes() {
        return this.node.attributes();
    }

    public Iterator childNodes() {
        return this.node.childNodes();
    }

    public GPathResult find(final Closure closure) {
        if (DefaultTypeTransformation.castToBoolean(closure.call(new Object[]{this.node}))) {
            return this;
        } else {
            return new NoChildren(this, "", this.namespaceTagHints);
        }
    }

    public GPathResult findAll(final Closure closure) {
        return find(closure);
    }

    public void build(final GroovyObject builder) {
        this.node.build(builder, this.namespaceMap, this.namespaceTagHints);
    }

    public Writer writeTo(final Writer out) throws IOException {
        return this.node.writeTo(out);
    }

    protected void replaceNode(final Closure newValue) {
        this.node.replaceNode(newValue, this);
    }

    protected void replaceBody(final Object newValue) {
        this.node.replaceBody(newValue);
    }

    protected void appendNode(final Object newValue) {
        this.node.appendNode(newValue, this);
    }
}

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