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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.xml.bind.v2.runtime.unmarshaller;

import java.io.IOException;

import com.sun.xml.bind.v2.runtime.output.Pcdata;
import com.sun.xml.bind.v2.runtime.output.UTF8XmlOutput;

/**
 * {@link Pcdata} that represents a single integer.
 *
 * @author Kohsuke Kawaguchi
 */
public class IntData extends Pcdata {
    /**
     * The int value that this {@link Pcdata} represents.
     *
     * Modifiable.
     */
    private int data;

    /**
     * Length of the {@link #data} in ASCII string.
     * For example if data=-10, then length=3
     */
    private int length;

    public void reset(int i) {
        this.data = i;
        if(i==Integer.MIN_VALUE)
            length = 11;
        else
            length = (i < 0) ? stringSizeOfInt(-i) + 1 : stringSizeOfInt(i);
    }

    private final static int [] sizeTable = { 9, 99, 999, 9999, 99999, 999999, 9999999,
                                     99999999, 999999999, Integer.MAX_VALUE };

    // Requires positive x
    private static int stringSizeOfInt(int x) {
        for (int i=0; ; i++)
            if (x <= sizeTable[i])
                return i+1;
    }

    public String toString() {
        return String.valueOf(data);
    }


    public int length() {
        return length;
    }

    public char charAt(int index) {
        return toString().charAt(index);
    }

    public CharSequence subSequence(int start, int end) {
        return toString().substring(start,end);
    }

    public void writeTo(UTF8XmlOutput output) throws IOException {
        output.text(data);
    }
}