/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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;

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

import org.apache.bcel.classfile.ConstantDouble;
import org.apache.bcel.classfile.ConstantFloat;
import org.apache.bcel.classfile.ConstantInteger;
import org.apache.bcel.classfile.ConstantLong;
import org.apache.bcel.classfile.ConstantUtf8;
import org.apache.bcel.classfile.ElementValue;
import org.apache.bcel.classfile.SimpleElementValue;

Since:
6.0/**
 * @since 6.0
 */
public class SimpleElementValueGen extends ElementValueGen
{
    // 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 ctor used for deserialization, doesn't *put* an entry in the
     * constant pool, assumes the one at the supplied index is correct.
     */
    protected SimpleElementValueGen(final int type, final int idx, final ConstantPoolGen cpGen)
    {
        super(type, cpGen);
        this.idx = idx;
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final int value)
    {
        super(type, cpGen);
        idx = getConstantPool().addInteger(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final long value)
    {
        super(type, cpGen);
        idx = getConstantPool().addLong(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final double value)
    {
        super(type, cpGen);
        idx = getConstantPool().addDouble(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final float value)
    {
        super(type, cpGen);
        idx = getConstantPool().addFloat(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final short value)
    {
        super(type, cpGen);
        idx = getConstantPool().addInteger(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final byte value)
    {
        super(type, cpGen);
        idx = getConstantPool().addInteger(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final char value)
    {
        super(type, cpGen);
        idx = getConstantPool().addInteger(value);
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final boolean value)
    {
        super(type, cpGen);
        if (value) {
            idx = getConstantPool().addInteger(1);
        } else {
            idx = getConstantPool().addInteger(0);
        }
    }

    public SimpleElementValueGen(final int type, final ConstantPoolGen cpGen, final String value)
    {
        super(type, cpGen);
        idx = getConstantPool().addUtf8(value);
    }

    
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.
/**
     * 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 SimpleElementValueGen(final SimpleElementValue value,
            final ConstantPoolGen cpool, final 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 " + super.getElementValueType());
            }
        }
    }

    
Return immutable variant
/**
     * Return immutable variant
     */
    @Override
    public ElementValue getElementValue()
    {
        return new SimpleElementValue(super.getElementValueType(), idx, getConstantPool().getConstantPool());
    }

    public int getIndex()
    {
        return idx;
    }

    public String getValueString()
    {
        if (super.getElementValueType() != STRING) {
            throw new RuntimeException(
                    "Dont call getValueString() on a non STRING ElementValue");
        }
        final ConstantUtf8 c = (ConstantUtf8) getConstantPool().getConstant(idx);
        return c.getBytes();
    }

    public int getValueInt()
    {
        if (super.getElementValueType() != PRIMITIVE_INT) {
            throw new RuntimeException(
                    "Dont call getValueString() on a non STRING ElementValue");
        }
        final ConstantInteger c = (ConstantInteger) getConstantPool().getConstant(idx);
        return c.getBytes();
    }

    // Whatever kind of value it is, return it as a string
    @Override
    public String stringifyValue()
    {
        switch (super.getElementValueType())
        {
        case PRIMITIVE_INT:
            final ConstantInteger c = (ConstantInteger) getConstantPool().getConstant(idx);
            return Integer.toString(c.getBytes());
        case PRIMITIVE_LONG:
            final ConstantLong j = (ConstantLong) getConstantPool().getConstant(idx);
            return Long.toString(j.getBytes());
        case PRIMITIVE_DOUBLE:
            final ConstantDouble d = (ConstantDouble) getConstantPool().getConstant(idx);
            return Double.toString(d.getBytes());
        case PRIMITIVE_FLOAT:
            final ConstantFloat f = (ConstantFloat) getConstantPool().getConstant(idx);
            return Float.toString(f.getBytes());
        case PRIMITIVE_SHORT:
            final ConstantInteger s = (ConstantInteger) getConstantPool().getConstant(idx);
            return Integer.toString(s.getBytes());
        case PRIMITIVE_BYTE:
            final ConstantInteger b = (ConstantInteger) getConstantPool().getConstant(idx);
            return Integer.toString(b.getBytes());
        case PRIMITIVE_CHAR:
            final ConstantInteger ch = (ConstantInteger) getConstantPool().getConstant(idx);
            return Integer.toString(ch.getBytes());
        case PRIMITIVE_BOOLEAN:
            final ConstantInteger bo = (ConstantInteger) getConstantPool().getConstant(idx);
            if (bo.getBytes() == 0) {
                return "false";
            }
            return "true";
        case STRING:
            final ConstantUtf8 cu8 = (ConstantUtf8) getConstantPool().getConstant(idx);
            return cu8.getBytes();
        default:
            throw new RuntimeException(
                "SimpleElementValueGen class does not know how to stringify type " + super.getElementValueType());
        }
    }

    @Override
    public void dump(final DataOutputStream dos) throws IOException
    {
        dos.writeByte(super.getElementValueType()); // u1 kind of value
        switch (super.getElementValueType())
        {
        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 " + super.getElementValueType());
        }
    }
}