DecimalData.java

/*
 * Copyright (C) 2009 JavaRosa
 *
 * 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.openrosa.client.jr.core.model.data;

import java.io.IOException;

import org.openrosa.client.java.io.DataInputStream;
import org.openrosa.client.java.io.DataOutputStream;
import org.openrosa.client.jr.core.util.externalizable.DeserializationException;
import org.openrosa.client.jr.core.util.externalizable.ExtUtil;
import org.openrosa.client.jr.core.util.externalizable.PrototypeFactory;


/**
 * A response to a question requesting an Decimal Value.  Adapted from IntegerData
 * @author Brian DeRenzi
 *
 */
public class DecimalData implements IAnswerData {
	double d;

	/**
	 * Empty Constructor, necessary for dynamic construction during deserialization.
	 * Shouldn't be used otherwise.
	 */
	public DecimalData() {
		
	}
	
	public DecimalData(double d) {
		this.d = d;
	}
	public DecimalData(Double d) {
		setValue(d);
	}
	
	public IAnswerData clone () {
		return new DecimalData(d);
	}
	
	/* (non-Javadoc)
	 * @see org.javarosa.core.model.data.IAnswerData#getDisplayText()
	 */
	public String getDisplayText() {
		return String.valueOf(d);
	}

	/* (non-Javadoc)
	 * @see org.javarosa.core.model.data.IAnswerData#getValue()
	 */
	public Object getValue() {
		return new Double(d); 
	}
	
	public void setValue(Object o) {
		if(o == null) {
			throw new NullPointerException("Attempt to set an IAnswerData class to null.");
		}
		d = ((Double)o).doubleValue();
	}
	
	/* (non-Javadoc)
	 * @see org.javarosa.core.services.storage.utilities.Externalizable#readExternal(java.io.DataInputStream)
	 */
	public void readExternal(DataInputStream in, PrototypeFactory pf) throws IOException, DeserializationException {
		d = ExtUtil.readDecimal(in);
	}

	/* (non-Javadoc)
	 * @see org.javarosa.core.services.storage.utilities.Externalizable#writeExternal(java.io.DataOutputStream)
	 */
	public void writeExternal(DataOutputStream out) throws IOException {
		ExtUtil.writeDecimal(out, d);
	}
}