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/***

 * ASM: a very small and fast Java bytecode manipulation framework

 * Copyright (c) 2000-2005 INRIA, France Telecom

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. Neither the name of the copyright holders nor the names of its

 *    contributors may be used to endorse or promote products derived from

 *    this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF

 * THE POSSIBILITY OF SUCH DAMAGE.

 */

package org.objectweb.asm.optimizer;

import java.util.HashMap;

import org.objectweb.asm.Type;

/**

 * A constant pool.

 *

 * @author Eric Bruneton

 */

public class ConstantPool extends HashMap {

    private Constant key1 = new Constant();

    private Constant key2 = new Constant();

    private Constant key3 = new Constant();

    public Constant newInteger(final int value) {

        key1.set(value);

        Constant result = get(key1);

        if (result == null) {

            result = new Constant(key1);

            put(result);

        }

        return result;

    }

    public Constant newFloat(final float value) {

        key1.set(value);

        Constant result = get(key1);

        if (result == null) {

            result = new Constant(key1);

            put(result);

        }

        return result;

    }

    public Constant newLong(final long value) {

        key1.set(value);

        Constant result = get(key1);

        if (result == null) {

            result = new Constant(key1);

            put(result);

        }

        return result;

    }

    public Constant newDouble(final double value) {

        key1.set(value);

        Constant result = get(key1);

        if (result == null) {

            result = new Constant(key1);

            put(result);

        }

        return result;

    }

    public Constant newUTF8(final String value) {

        key1.set('s', value, null, null);

        Constant result = get(key1);

        if (result == null) {

            result = new Constant(key1);

            put(result);

        }

        return result;

    }

    private Constant newString(final String value) {

        key2.set('S', value, null, null);

        Constant result = get(key2);

        if (result == null) {

            newUTF8(value);

            result = new Constant(key2);

            put(result);

        }

        return result;

    }

    public Constant newClass(final String value) {

        key2.set('C', value, null, null);

        Constant result = get(key2);

        if (result == null) {

            newUTF8(value);

            result = new Constant(key2);

            put(result);

        }

        return result;

    }

    public Constant newConst(final Object cst) {

        if (cst instanceof Integer) {

            int val = ((Integer) cst).intValue();

            return newInteger(val);

        } else if (cst instanceof Float) {

            float val = ((Float) cst).floatValue();

            return newFloat(val);

        } else if (cst instanceof Long) {

            long val = ((Long) cst).longValue();

            return newLong(val);

        } else if (cst instanceof Double) {

            double val = ((Double) cst).doubleValue();

            return newDouble(val);

        } else if (cst instanceof String) {

            return newString((String) cst);

        } else if (cst instanceof Type) {

            Type t = (Type) cst;

            return newClass(t.getSort() == Type.OBJECT

                    ? t.getInternalName()

                    : t.getDescriptor());

        } else {

            throw new IllegalArgumentException("value " + cst);

        }

    }

    public Constant newField(

        final String owner,

        final String name,

        final String desc)

    {

        key3.set('G', owner, name, desc);

        Constant result = get(key3);

        if (result == null) {

            newClass(owner);

            newNameType(name, desc);

            result = new Constant(key3);

            put(result);

        }

        return result;

    }

    public Constant newMethod(

        final String owner,

        final String name,

        final String desc,

        final boolean itf)

    {

        key3.set(itf ? 'N' : 'M', owner, name, desc);

        Constant result = get(key3);

        if (result == null) {

            newClass(owner);

            newNameType(name, desc);

            result = new Constant(key3);

            put(result);

        }

        return result;

    }

    public Constant newNameType(final String name, final String desc) {

        key2.set('T', name, desc, null);

        Constant result = get(key2);

        if (result == null) {

            newUTF8(name);

            newUTF8(desc);

            result = new Constant(key2);

            put(result);

        }

        return result;

    }

    private Constant get(final Constant key) {

        return (Constant) get((Object) key);

    }

    private void put(final Constant cst) {

        put(cst, cst);

    }

}