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Groovy example source code file (Tuple.java)

This example Groovy source code file (Tuple.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

abstractlist, abstractlist, list, list, object, object, tuple, tuple, util

The Groovy Tuple.java source code

/*
 * Copyright 2003-2007 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.lang;

import java.util.AbstractList;
import java.util.List;

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

/**
 * Represents a list of Integer objects from a specified int up to but not including
 * a given and to.
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @version $Revision: 6778 $
 */
public class Tuple extends AbstractList {

    private Object[] contents;
    private int hashCode;

    public Tuple(Object[] contents) {
        this.contents = contents;
    }

    public Object get(int index) {
        return contents[index];
    }

    public int size() {
        return contents.length;
    }

    public boolean equals(Object that) {
        if (that instanceof Tuple) {
            return equals((Tuple) that);
        }
        return false;
    }

    public boolean equals(Tuple that) {
        if (contents.length == that.contents.length) {
            for (int i = 0; i < contents.length; i++) {
                if (! DefaultTypeTransformation.compareEqual(this.contents[i], that.contents[i])) {
                    return false;
                }
            }
            return true;
        }
        return false;
    }


    public int hashCode() {
        if (hashCode == 0) {
            for (int i = 0; i < contents.length; i++ ) {
                Object value = contents[i];
                int hash = (value != null) ? value.hashCode() : 0xbabe;
                hashCode ^= hash;
            }
            if (hashCode == 0) {
                hashCode = 0xbabe;
            }
        }
        return hashCode;
    }

    public List subList(int fromIndex, int toIndex) {
        int size = toIndex - fromIndex;
        Object[] newContent = new Object[size];
        System.arraycopy(contents, fromIndex, newContent, 0, size);
        return new Tuple(newContent);
    }
}

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