/* *******************************************************************
 * Copyright (c) 2004 IBM
 * All rights reserved. 
 * This program and the accompanying materials are made available 
 * under the terms of the Eclipse Public License v1.0 
 * which accompanies this distribution and is available at 
 * http://www.eclipse.org/legal/epl-v10.html 
 *  
 * Contributors: 
 *     Andy Clement -     initial implementation {date}
 * ******************************************************************/

package org.aspectj.apache.bcel.classfile.annotation;

import java.io.DataOutputStream;
import java.io.IOException;

import org.aspectj.apache.bcel.Constants;
import org.aspectj.apache.bcel.classfile.ConstantDouble;
import org.aspectj.apache.bcel.classfile.ConstantFloat;
import org.aspectj.apache.bcel.classfile.ConstantInteger;
import org.aspectj.apache.bcel.classfile.ConstantLong;
import org.aspectj.apache.bcel.classfile.ConstantPool;
import org.aspectj.apache.bcel.classfile.ConstantUtf8;

public class SimpleElementValue extends ElementValue {

	// For primitive types and string type, this points to the value entry in the cpGen
	// For 'class' this points to the class entry in the cpGen
	private int idx;

	// ctors for each supported type... type could be inferred but for now lets
	// force it to be passed

	/**
	 * Protected ctor used for deserialization, doesn't *put* an entry in the constant pool, assumes the one at the supplied index
	 * is correct.
	 */
	protected SimpleElementValue(int type, int idx, ConstantPool cpGen) {
		super(type, cpGen);
		this.idx = idx;
	}

	public SimpleElementValue(int type, ConstantPool cpGen, int value) {
		super(type, cpGen);
		idx = cpGen.addInteger(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, long value) {
		super(type, cpGen);
		idx = cpGen.addLong(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, double value) {
		super(type, cpGen);
		idx = cpGen.addDouble(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, float value) {
		super(type, cpGen);
		idx = cpGen.addFloat(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, short value) {
		super(type, cpGen);
		idx = cpGen.addInteger(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, byte value) {
		super(type, cpGen);
		idx = cpGen.addInteger(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, char value) {
		super(type, cpGen);
		idx = cpGen.addInteger(value);
	}

	public SimpleElementValue(int type, ConstantPool cpGen, boolean value) {
		super(type, cpGen);
		if (value) {
			idx = cpGen.addInteger(1);
		} else {
			idx = cpGen.addInteger(0);
		}
	}

	public SimpleElementValue(int type, ConstantPool cpGen, String value) {
		super(type, cpGen);
		idx = cpGen.addUtf8(value);
	}

	public byte getValueByte() {
		if (type != PRIMITIVE_BYTE) {
			throw new RuntimeException("Dont call getValueByte() on a non BYTE ElementValue");
		}
		ConstantInteger c = (ConstantInteger) cpool.getConstant(idx, Constants.CONSTANT_Integer);
		return (byte) c.getIntValue();
	}

	public char getValueChar() {
		if (type != PRIMITIVE_CHAR) {
			throw new RuntimeException("Dont call getValueChar() on a non CHAR ElementValue");
		}
		ConstantInteger c = (ConstantInteger) cpool.getConstant(idx, Constants.CONSTANT_Integer);
		return (char) c.getIntValue();
	}

	public long getValueLong() {
		if (type != PRIMITIVE_LONG) {
			throw new RuntimeException("Dont call getValueLong() on a non LONG ElementValue");
		}
		ConstantLong j = (ConstantLong) cpool.getConstant(idx);
		return j.getValue();
	}

	public float getValueFloat() {
		if (type != PRIMITIVE_FLOAT) {
			throw new RuntimeException("Dont call getValueFloat() on a non FLOAT ElementValue");
		}
		ConstantFloat f = (ConstantFloat) cpool.getConstant(idx);
		return f.getValue();
	}

	public double getValueDouble() {
		if (type != PRIMITIVE_DOUBLE) {
			throw new RuntimeException("Dont call getValueDouble() on a non DOUBLE ElementValue");
		}
		ConstantDouble d = (ConstantDouble) cpool.getConstant(idx);
		return d.getValue();
	}

	public boolean getValueBoolean() {
		if (type != PRIMITIVE_BOOLEAN) {
			throw new RuntimeException("Dont call getValueBoolean() on a non BOOLEAN ElementValue");
		}
		ConstantInteger bo = (ConstantInteger) cpool.getConstant(idx);
		return (bo.getValue() != 0);
	}

	public short getValueShort() {
		if (type != PRIMITIVE_SHORT) {
			throw new RuntimeException("Dont call getValueShort() on a non SHORT ElementValue");
		}
		ConstantInteger s = (ConstantInteger) cpool.getConstant(idx);
		return (short) s.getIntValue();
	}

	/**
	 * The boolean controls whether we copy info from the 'old' constant pool to the 'new'. You need to use this ctor if the
	 * annotation is being copied from one file to another.
	 */
	public SimpleElementValue(SimpleElementValue value, ConstantPool cpool, boolean copyPoolEntries) {
		super(value.getElementValueType(), cpool);
		if (!copyPoolEntries) {
			// J5ASSERT: Could assert value.stringifyValue() is the same as
			// cpool.getConstant(SimpleElementValuevalue.getIndex())
			idx = value.getIndex();
		} else {
			switch (value.getElementValueType()) {
			case STRING:
				idx = cpool.addUtf8(value.getValueString());
				break;
			case PRIMITIVE_INT:
				idx = cpool.addInteger(value.getValueInt());
				break;
			case PRIMITIVE_BYTE:
				idx = cpool.addInteger(value.getValueByte());
				break;
			case PRIMITIVE_CHAR:
				idx = cpool.addInteger(value.getValueChar());
				break;
			case PRIMITIVE_LONG:
				idx = cpool.addLong(value.getValueLong());
				break;
			case PRIMITIVE_FLOAT:
				idx = cpool.addFloat(value.getValueFloat());
				break;
			case PRIMITIVE_DOUBLE:
				idx = cpool.addDouble(value.getValueDouble());
				break;
			case PRIMITIVE_BOOLEAN:
				if (value.getValueBoolean()) {
					idx = cpool.addInteger(1);
				} else {
					idx = cpool.addInteger(0);
				}
				break;
			case PRIMITIVE_SHORT:
				idx = cpool.addInteger(value.getValueShort());
				break;
			default:
				throw new RuntimeException("SimpleElementValueGen class does not know how " + "to copy this type " + type);
			}
		}
	}

	public int getIndex() {
		return idx;
	}

	public String getValueString() {
		if (type != STRING) {
			throw new RuntimeException("Dont call getValueString() on a non STRING ElementValue");
		}
		ConstantUtf8 c = (ConstantUtf8) cpool.getConstant(idx);
		return c.getValue();
	}

	public int getValueInt() {
		if (type != PRIMITIVE_INT) {
			throw new RuntimeException("Dont call getValueString() on a non STRING ElementValue");
		}
		ConstantInteger c = (ConstantInteger) cpool.getConstant(idx);
		return c.getValue();
	}

	// Whatever kind of value it is, return it as a string
	@Override
	public String stringifyValue() {
		switch (type) {
		case PRIMITIVE_INT:
			ConstantInteger c = (ConstantInteger) cpool.getConstant(idx);
			return Integer.toString(c.getValue());
		case PRIMITIVE_LONG:
			ConstantLong j = (ConstantLong) cpool.getConstant(idx);
			return Long.toString(j.getValue());
		case PRIMITIVE_DOUBLE:
			ConstantDouble d = (ConstantDouble) cpool.getConstant(idx);
			return d.getValue().toString();
		case PRIMITIVE_FLOAT:
			ConstantFloat f = (ConstantFloat) cpool.getConstant(idx);
			return Float.toString(f.getValue());
		case PRIMITIVE_SHORT:
			ConstantInteger s = (ConstantInteger) cpool.getConstant(idx);
			return Integer.toString(s.getValue());
		case PRIMITIVE_BYTE:
			ConstantInteger b = (ConstantInteger) cpool.getConstant(idx);
			return Integer.toString(b.getValue());
		case PRIMITIVE_CHAR:
			ConstantInteger ch = (ConstantInteger) cpool.getConstant(idx);
			return new Character((char) ch.getIntValue()).toString();
		case PRIMITIVE_BOOLEAN:
			ConstantInteger bo = (ConstantInteger) cpool.getConstant(idx);
			if (bo.getValue() == 0) {
				return "false";
			} else {
				return "true";
			}
		case STRING:
			ConstantUtf8 cu8 = (ConstantUtf8) cpool.getConstant(idx);
			return cu8.getValue();

		default:
			throw new RuntimeException("SimpleElementValueGen class does not know how to stringify type " + type);
		}
	}

	@Override
	public String toString() {
		StringBuilder s = new StringBuilder();
		switch (type) {
		case PRIMITIVE_INT:
			ConstantInteger c = (ConstantInteger) cpool.getConstant(idx);
			s.append("(int)").append(Integer.toString(c.getValue()));
			break;
		case PRIMITIVE_LONG:
			ConstantLong j = (ConstantLong) cpool.getConstant(idx);
			s.append("(long)").append(Long.toString(j.getValue()));
			break;
		case PRIMITIVE_DOUBLE:
			ConstantDouble d = (ConstantDouble) cpool.getConstant(idx);
			s.append("(double)").append(d.getValue().toString());
			break;
		case PRIMITIVE_FLOAT:
			ConstantFloat f = (ConstantFloat) cpool.getConstant(idx);
			s.append("(float)").append(Float.toString(f.getValue()));
			break;
		case PRIMITIVE_SHORT:
			ConstantInteger ci = (ConstantInteger) cpool.getConstant(idx);
			s.append("(short)").append(Integer.toString(ci.getValue()));
			break;
		case PRIMITIVE_BYTE:
			ConstantInteger b = (ConstantInteger) cpool.getConstant(idx);
			s.append("(byte)").append(Integer.toString(b.getValue()));
			break;
		case PRIMITIVE_CHAR:
			ConstantInteger ch = (ConstantInteger) cpool.getConstant(idx);
			s.append("(char)").append(new Character((char) ch.getIntValue()).toString());
			break;
		case PRIMITIVE_BOOLEAN:
			ConstantInteger bo = (ConstantInteger) cpool.getConstant(idx);
			s.append("(boolean)");
			if (bo.getValue() == 0) {
				s.append("false");
			} else {
				s.append("true");
			}
			break;
		case STRING:
			ConstantUtf8 cu8 = (ConstantUtf8) cpool.getConstant(idx);
			s.append("(string)").append(cu8.getValue());
			break;
		default:
			throw new RuntimeException("SimpleElementValueGen class does not know how to stringify type " + type);
		}
		return s.toString();
	}

	@Override
	public void dump(DataOutputStream dos) throws IOException {
		dos.writeByte(type); // u1 kind of value
		switch (type) {
		case PRIMITIVE_INT:
		case PRIMITIVE_BYTE:
		case PRIMITIVE_CHAR:
		case PRIMITIVE_FLOAT:
		case PRIMITIVE_LONG:
		case PRIMITIVE_BOOLEAN:
		case PRIMITIVE_SHORT:
		case PRIMITIVE_DOUBLE:
		case STRING:
			dos.writeShort(idx);
			break;
		default:
			throw new RuntimeException("SimpleElementValueGen doesnt know how to write out type " + type);
		}
	}

}