/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.lang;

import java.lang.StackWalker.Option;

import java.util.EnumSet;

import java.util.Set;

import static java.lang.StackWalker.ExtendedOption.*;

final class LiveStackFrameInfo extends StackFrameInfo implements LiveStackFrame {

    private static Object[] EMPTY_ARRAY = new Object[0];

    LiveStackFrameInfo(StackWalker walker) {

        super(walker);

    }

    // These fields are initialized by the VM if ExtendedOption.LOCALS_AND_OPERANDS is set

    private Object[] monitors = EMPTY_ARRAY;

    private Object[] locals = EMPTY_ARRAY;

    private Object[] operands = EMPTY_ARRAY;

    @Override

    public Object[] getMonitors() {

        return monitors;

    }

    @Override

    public Object[] getLocals() {

        return locals;

    }

    @Override

    public Object[] getStack() {

        return operands;

    }

    /*

     * Convert primitive value to {@code Primitive} object to represent

     * a local variable or an element on the operand stack of primitive type.

     */

    static PrimitiveValue asPrimitive(boolean value) {

        return new BooleanPrimitive(value);

    }

    static PrimitiveValue asPrimitive(int value) {

        return new IntPrimitive(value);

    }

    static PrimitiveValue asPrimitive(short value) {

        return new ShortPrimitive(value);

    }

    static PrimitiveValue asPrimitive(char value) {

        return new CharPrimitive(value);

    }

    static PrimitiveValue asPrimitive(byte value) {

        return new BytePrimitive(value);

    }

    static PrimitiveValue asPrimitive(long value) {

        return new LongPrimitive(value);

    }

    static PrimitiveValue asPrimitive(float value) {

        return new FloatPrimitive(value);

    }

    static PrimitiveValue asPrimitive(double value) {

        return new DoublePrimitive(value);

    }

    private static class IntPrimitive extends PrimitiveValue {

        final int value;

        IntPrimitive(int value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'I';

        }

        @Override

        public int intValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class ShortPrimitive extends PrimitiveValue {

        final short value;

        ShortPrimitive(short value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'S';

        }

        @Override

        public short shortValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class BooleanPrimitive extends PrimitiveValue {

        final boolean value;

        BooleanPrimitive(boolean value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'Z';

        }

        @Override

        public boolean booleanValue()  {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class CharPrimitive extends PrimitiveValue {

        final char value;

        CharPrimitive(char value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'C';

        }

        @Override

        public char charValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class BytePrimitive extends PrimitiveValue {

        final byte value;

        BytePrimitive(byte value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'B';

        }

        @Override

        public byte byteValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class LongPrimitive extends PrimitiveValue {

        final long value;

        LongPrimitive(long value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'J';

        }

        @Override

        public long longValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class FloatPrimitive extends PrimitiveValue {

        final float value;

        FloatPrimitive(float value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'F';

        }

        @Override

        public float floatValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

    private static class DoublePrimitive extends PrimitiveValue {

        final double value;

        DoublePrimitive(double value) {

            this.value = value;

        }

        @Override

        public char type() {

            return 'D';

        }

        @Override

        public double doubleValue() {

            return value;

        }

        @Override

        public String toString() {

            return String.valueOf(value);

        }

    }

}