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A Java library for 2D and 3D geometric calculations
There is a newer version: 2.9
/**
 *    Copyright 2011 Peter Murray-Rust
 *
 *    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.xmlcml.stml.attribute;

import java.text.ParseException;

import org.xmlcml.euclid.Util;
import org.xmlcml.stml.STMLAttribute;

import nu.xom.Attribute;
import nu.xom.Node;

/**
 * attribute representing a double value.
 * 
 */

public class DoubleSTAttribute extends STMLAttribute {

    /** dewisott */
	public final static String JAVA_TYPE = "double";

    /** dewisott */
	public final static String JAVA_GET_METHOD = "getDouble";

    /** dewisott */
	public final static String JAVA_SHORT_CLASS = "DoubleSTAttribute";

	protected Double d;

	/**
	 * constructor.
	 * 
	 * @param name
	 */
	public DoubleSTAttribute(String name) {
		super(name);
	}

	/**
	 * from DOM.
	 * 
	 * @param att
	 */
	public DoubleSTAttribute(Attribute att) {
		this(att.getLocalName());
		String v = att.getValue();
		if (v != null && !v.trim().equals(S_EMPTY)) {
			this.setSTMLValue(v);
		}
	}

	/**
	 * from DOM.
	 * 
	 * @param att
	 *            to copy, except value
	 * @param value
	 */
	public DoubleSTAttribute(Attribute att, String value) {
		super(att, value.trim());
	}

	/**
	 * copy constructor
	 * 
	 * @param att
	 */
	public DoubleSTAttribute(DoubleSTAttribute att) {
		super(att);
		if (att.d != null) {
			this.d = Double.valueOf(att.d.doubleValue());
		}
	}

	/**
	 * copy. uses copy constructor.
	 * 
	 * @return copy
	 */
	public Attribute copy() {
		return new DoubleSTAttribute(this);
	}

	/**
	 * get java type.
	 * 
	 * @return java type
	 */
	public String getJavaType() {
		return "double";
	}

	/**
	 * sets value. throws exception if of wrong type or violates restriction
	 * 
	 * @param s
	 *            the value
	 * @throws RuntimeException
	 */
	public void setSTMLValue(String s) {
		if (s != null && !s.trim().equals(S_EMPTY)) {
			double d;
			try {
				String ss = s.trim();
				if (ss.startsWith(S_PLUS)) {
					ss = ss.substring(1);
				}
				d = (Util.parseFlexibleDouble(ss));
			} catch (NumberFormatException nfe) {
				throw new RuntimeException("" + nfe, nfe);
			} catch (ParseException e) {
				throw new RuntimeException("Bad double: " + s.trim(), e);
			}
			this.setSTMLValue(d);
		}
	}

	/**
	 * checks value of simpleType. if value does not check
	 * against SimpleType uses STMLType.checkvalue() fails if type is String or
	 * int or is a list
	 * 
	 * @param d
	 *            the double
	 * @throws RuntimeException
	 *             wrong type or value fails
	 */
	public void checkValue(double d) throws RuntimeException {
		if (cmlType != null) {
			cmlType.checkValue(d);
		}
	}

	/**
	 * set and check value.
	 * 
	 * @param d
	 */
	public void setSTMLValue(double d) {
		checkValue(d);
		this.d = Double.valueOf(d);
		this.setValue("" + d);
	}

	/**
	 * get double.
	 * 
	 * @return value
	 */
	public double getDouble() {
		return d.doubleValue();
	}

	/**
	 * get java method.
	 * 
	 * @return java method
	 */
	public String getJavaGetMethod() {
		return JAVA_GET_METHOD;
	}

	/**
	 * get java short class name.
	 * 
	 * @return java short className
	 */
	public String getJavaShortClassName() {
		return JAVA_SHORT_CLASS;
	}

};