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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.cos;

/**
 * This class represents integer numbers in pdf
 */
public class COSInteger extends COSNumber {
    public static COSInteger create(byte[] bytes, int start, int length) {
        int result = 0;
        int end = start + length;
        boolean negative = false;
        byte prefix = bytes[start];
        if (prefix == '+') {
            start++;
        } else if (prefix == '-') {
            negative = true;
            start++;
        }
        for (int i = start; i < end; i++) {
            result = ((result * 10) + bytes[i]) - '0';
        }
        if (negative) {
            return new COSInteger(-result);
        }
        return new COSInteger(result);
    }

    public static COSInteger create(int value) {
        return new COSInteger(value);
    }

    public static COSInteger createStrict(byte[] bytes, int start, int length) {
        long resultLong = 0;
        int end = start + length;
        boolean negative = false;
        byte prefix = bytes[start];
        if (prefix == '+') {
            start++;
        } else if (prefix == '-') {
            negative = true;
            start++;
        }
        for (int i = start; i < end; i++) {
            resultLong = ((resultLong * 10) + bytes[i]) - '0';
        }

        if (negative) {
            resultLong = -resultLong;
        }

        if (resultLong > Integer.MAX_VALUE || resultLong < Integer.MIN_VALUE) {
            return null;
        }

        return new COSInteger((int) resultLong);
    }

    /**
     * the integer value represented
     */
    private final int value;

    protected COSInteger(int newValue) {
        value = newValue;
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSObject#accept(de.intarsys.pdf.cos.ICOSObjectVisitor)
     */
    @Override
    public java.lang.Object accept(ICOSObjectVisitor visitor) throws COSVisitorException {
        return visitor.visitFromInteger(this);
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSObject#asInteger()
     */
    @Override
    public COSInteger asInteger() {
        return this;
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSObject#basicToString()
     */
    @Override
    protected String basicToString() {
        return String.valueOf(intValue());
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSObject#copyBasic()
     */
    @Override
    protected COSObject copyBasic() {
        return new COSInteger(value);
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object o) {
        if (!(o instanceof COSInteger)) {
            return false;
        }
        return value == ((COSInteger) o).intValue();
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSNumber#floatValue()
     */
    @Override
    public float floatValue() {
        return value;
    }

    /*
     * (non-Javadoc)
     *
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
        return value;
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.pdf.cos.COSNumber#intValue()
     */
    @Override
    public int intValue() {
        return value;
    }

    /*
     * (non-Javadoc)
     *
     * @see de.intarsys.tools.objectsession.ISaveStateSupport#saveState()
     */
    @Override
    public Object saveState() {
        COSInteger result = new COSInteger(value);
        result.container = this.container.saveStateContainer();
        return result;
    }
}