de.intarsys.pdf.cos.COSFixed Maven / Gradle / Ivy

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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;

/**
 * Represents floating point numbers in pdf.
 */
public class COSFixed extends COSNumber {
	static public final int DEFAULT_PRECISION = 5;

	static public COSFixed create(byte[] bytes, int start, int length) {
		long result = 0;
		long decimal = 1;
		int end = start + length;
		boolean negative = false;
		boolean point = false;
		int precision = 0;
		int i = start;
		byte prefix = bytes[i];
		if (prefix == '+') {
			i++;
		} else if (prefix == '-') {
			negative = true;
			i++;
		}
		for (; i < end; i++) {
			byte digit = bytes[i];
			if (digit == '.') {
				point = true;
			} else {
				result = ((result * 10) + digit) - '0';
				if (point) {
					decimal = decimal * 10;
					precision++;
				}
			}
		}
		if (negative) {
			return new COSFixed(-(float) ((double) result / (double) decimal),
					precision);
		}
		return new COSFixed((float) ((double) result / (double) decimal),
				precision);
	}

	static public COSFixed create(double value) {
		return new COSFixed((float) value, DEFAULT_PRECISION);
	}

	static public COSFixed create(double value, int precision) {
		return new COSFixed((float) value, precision);
	}

	static public COSFixed create(float value) {
		return new COSFixed(value, DEFAULT_PRECISION);
	}

	static public COSFixed create(float value, int precision) {
		return new COSFixed(value, precision);
	}

	private final float floatValue;

	private byte precision;

	protected COSFixed(float value, int precision) {
		this.floatValue = value;
		this.precision = (byte) precision;
	}

	/*
	 * (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.visitFromFixed(this);
	}

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

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

	@Override
	protected COSObject copyBasic() {
		return new COSFixed(floatValue, precision);
	}

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

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

	/**
	 * The precision (digits after period) for this.
	 * 
	 * @return The precision (digits after period) for this.
	 */
	public int getPrecision() {
		return precision;
	}

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

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

	/*
	 * (non-Javadoc)
	 * 
	 * @see de.intarsys.pdf.cos.COSObject#restoreState(java.lang.Object)
	 */
	@Override
	public void restoreState(Object object) {
		super.restoreState(object);
		COSFixed fixed = (COSFixed) object;
		this.precision = fixed.precision;
	}

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

	/**
	 * Assign the precision for this.
	 * 
	 * @param precision
	 *            The new precision.
	 */
	public void setPrecision(int precision) {
		this.precision = (byte) precision;
	}
}