/*
 * Copyright  2000-2004 The Apache Software Foundation
 *
 *  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.apache.bcel.generic;

/**
 * FCONST - Push 0.0, 1.0 or 2.0, other values cause an exception
 * 
 * <PRE>
 * Stack: ... -&gt; ...,
 * </PRE>
 * 
 * @version $Id: FCONST.java 386056 2006-03-15 11:31:56Z tcurdt $
 * @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
 */
public class FCONST extends Instruction implements ConstantPushInstruction,
		TypedInstruction {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private float value;

	/**
	 * Empty constructor needed for the Class.newInstance() statement in
	 * Instruction.readInstruction(). Not to be used otherwise.
	 */
	FCONST() {
	}

	public FCONST(float f) {
		super(org.apache.bcel.Constants.FCONST_0, (short) 1);
		if (f == 0.0) {
			opcode = org.apache.bcel.Constants.FCONST_0;
		} else if (f == 1.0) {
			opcode = org.apache.bcel.Constants.FCONST_1;
		} else if (f == 2.0) {
			opcode = org.apache.bcel.Constants.FCONST_2;
		} else {
			throw new ClassGenException(
					"FCONST can be used only for 0.0, 1.0 and 2.0: " + f);
		}
		value = f;
	}

	@Override
	public Number getValue() {
		return new Float(value);
	}

	/**
	 * @return Type.FLOAT
	 */
	@Override
	public Type getType(ConstantPoolGen cp) {
		return Type.FLOAT;
	}

	/**
	 * Call corresponding visitor method(s). The order is: Call visitor methods
	 * of implemented interfaces first, then call methods according to the class
	 * hierarchy in descending order, i.e., the most specific visitXXX() call
	 * comes last.
	 * 
	 * @param v
	 *            Visitor object
	 */
	@Override
	public void accept(Visitor v) {
		v.visitPushInstruction(this);
		v.visitStackProducer(this);
		v.visitTypedInstruction(this);
		v.visitConstantPushInstruction(this);
		v.visitFCONST(this);
	}
}
