CharArraySequence.java Source code

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Here is the source code for CharArraySequence.java

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/*******************************************************************************
 * Copyright (c) 2008 xored software, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     xored software, Inc. - initial API and Implementation (Alex Panchenko)
 *******************************************************************************/

/**
 * {@link CharSequence} implementation backing by the char[]
 */
public class CharArraySequence implements CharSequence {

    private final char[] buff;
    private final int offset;
    private final int count;

    /**
     * @param buff
     */
    public CharArraySequence(char[] buff) {
        this(buff, 0, buff.length);
    }

    /**
     * @param buff
     * @param count
     */
    public CharArraySequence(char[] buff, int count) {
        this(buff, 0, count);
    }

    /**
     * @param buff
     * @param offset
     * @param count
     */
    public CharArraySequence(char[] buff, int offset, int count) {
        this.buff = buff;
        this.offset = offset;
        this.count = count;
    }

    /*
     * @see java.lang.CharSequence#charAt(int)
     */
    public char charAt(int index) {
        if (index < 0 || index >= count) {
            throw new StringIndexOutOfBoundsException(index);
        }
        return buff[offset + index];
    }

    /*
     * @see java.lang.CharSequence#length()
     */
    public int length() {
        return count;
    }

    /*
     * @see java.lang.CharSequence#subSequence(int, int)
     */
    public CharSequence subSequence(int beginIndex, int endIndex) {
        if (beginIndex < 0) {
            throw new StringIndexOutOfBoundsException(beginIndex);
        }
        if (endIndex > count) {
            throw new StringIndexOutOfBoundsException(endIndex);
        }
        if (beginIndex > endIndex) {
            throw new StringIndexOutOfBoundsException(endIndex - beginIndex);
        }
        return ((beginIndex == 0) && (endIndex == count)) ? this
                : new CharArraySequence(buff, offset + beginIndex, endIndex - beginIndex);
    }

    public String toString() {
        return new String(this.buff, this.offset, this.count);
    }
}