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Groovy example source code file (FastArray.java)

This example Groovy source code file (FastArray.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, cloneable, empty_list, empty_list, fastarray, fastarray, list, object, object, string, string, util

The Groovy FastArray.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 org.codehaus.groovy.util;

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

public class FastArray implements Cloneable {
    private Object[] data;
    public int size;
    public static final FastArray EMPTY_LIST = new FastArray(0);

    public FastArray(int initialCapacity) {
        data = new Object[initialCapacity];
    }

    public FastArray() {
       this (8);
    }

    public FastArray(Collection c) {
        this (c.toArray());
    }

    public FastArray(Object[] objects) {
        data = objects;
        size = objects.length;
    }

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

    public void add(Object o) {
        if (size == data.length) {
            Object [] newData = new Object[size == 0 ? 8 : size*2];
            System.arraycopy(data, 0, newData, 0, size);
            data = newData;
        }
        data [size++] = o;
    }

    public void set(int index, Object o) {
        data [index] = o;
    }

    public int size() {
        return size;
    }

    public void clear() {
        data = new Object[data.length];
        size = 0;
    }

    public void addAll(FastArray newData) {
        addAll(newData.data, newData.size);
    }

    public void addAll(Object [] newData, int size) {
        if (size == 0)
          return;
        final int newSize = this.size + size;
        if (newSize > data.length) {
            Object nd [] = new Object [newSize];
            System.arraycopy(data, 0, nd, 0, this.size);
            data = nd;
        }
        System.arraycopy(newData, 0, data, this.size, size);
        this.size = newSize;
    }

    public FastArray copy() {
        final Object[] newData = new Object[size];
        System.arraycopy(data, 0, newData, 0, size);
        return new FastArray(newData);
    }

    public boolean isEmpty() {
        return size == 0;
    }

    public void addAll(List coll) {
        final Object[] newData = coll.toArray();
        addAll(newData, newData.length);
    }

    public void remove(int index) {
        int numMoved = size - index - 1;
        if (numMoved > 0)
            System.arraycopy(data, index+1, data, index, numMoved);
        data[--size] = null;
    }

    public List toList () {
        return new AbstractList() {

            public Object get(int index) {
                return FastArray.this.get(index);
            }

            public int size() {
                return size;
            }
        };
    }

    public Object[] getArray() {
        return data;
    }

    public String toString() {
        if (size() == 0) return "[]";
        return toList().toString();
    }
}

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