/*

 * Copyright (c) 2012, 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 org.apidesign.javap;

import static org.apidesign.javap.RuntimeConstants.ITEM_Bogus;

import static org.apidesign.javap.RuntimeConstants.ITEM_Integer;

import static org.apidesign.javap.RuntimeConstants.ITEM_Float;

import static org.apidesign.javap.RuntimeConstants.ITEM_Double;

import static org.apidesign.javap.RuntimeConstants.ITEM_Long;

import static org.apidesign.javap.RuntimeConstants.ITEM_Null;

import static org.apidesign.javap.RuntimeConstants.ITEM_InitObject;

import static org.apidesign.javap.RuntimeConstants.ITEM_Object;

import static org.apidesign.javap.RuntimeConstants.ITEM_NewObject;

public final class TypeArray {

    private static final int CAPACITY_INCREMENT = 16;

    private int[] types;

    private int size;

    public TypeArray() {

    }

    public TypeArray(final TypeArray initialTypes) {

        setAll(initialTypes);

    }

    public void add(final int newType) {

        ensureCapacity(size + 1);

        types[size++] = newType;

    }

    public void addAll(final TypeArray newTypes) {

        addAll(newTypes.types, 0, newTypes.size);

    }

    public void addAll(final int[] newTypes) {

        addAll(newTypes, 0, newTypes.length);

    }

    public void addAll(final int[] newTypes,

                       final int offset,

                       final int count) {

        if (count > 0) {

            ensureCapacity(size + count);

            arraycopy(newTypes, offset, types, size, count);

            size += count;

        }

    }

    public void set(final int index, final int newType) {

        types[index] = newType;

    }

    public void setAll(final TypeArray newTypes) {

        setAll(newTypes.types, 0, newTypes.size);

    }

    public void setAll(final int[] newTypes) {

        setAll(newTypes, 0, newTypes.length);

    }

    public void setAll(final int[] newTypes,

                       final int offset,

                       final int count) {

        if (count > 0) {

            ensureCapacity(count);

            arraycopy(newTypes, offset, types, 0, count);

            size = count;

        } else {

            clear();

        }

    }

    public void setSize(final int newSize) {

        if (size != newSize) {

            ensureCapacity(newSize);

            for (int i = size; i < newSize; ++i) {

                types[i] = 0;

            }

            size = newSize;

        }

    }

    public void clear() {

        size = 0;

    }

    public int getSize() {

        return size;

    }

    public int get(final int index) {

        return types[index];

    }

    public static String typeString(final int type) {

        switch (type & 0xff) {

            case ITEM_Bogus:

                return "_top_";

            case ITEM_Integer:

                return "_int_";

            case ITEM_Float:

                return "_float_";

            case ITEM_Double:

                return "_double_";

            case ITEM_Long:

                return "_long_";

            case ITEM_Null:

                return "_null_";

            case ITEM_InitObject: // UninitializedThis

                return "_init_";

            case ITEM_Object:

                return "_object_";

            case ITEM_NewObject: // Uninitialized

                return "_new_";

            default:

                throw new IllegalArgumentException("Unknown type");

        }

    }

    @Override

    public String toString() {

        final StringBuilder sb = new StringBuilder("[");

        if (size > 0) {

            sb.append(typeString(types[0]));

            for (int i = 1; i < size; ++i) {

                sb.append(", ");

                sb.append(typeString(types[i]));

            }

        }

        return sb.append(']').toString();

    }

    private void ensureCapacity(final int minCapacity) {

        if ((minCapacity == 0)

                || (types != null) && (minCapacity <= types.length)) {

            return;

        }

        final int newCapacity =

                ((minCapacity + CAPACITY_INCREMENT - 1) / CAPACITY_INCREMENT)

                    * CAPACITY_INCREMENT;

        final int[] newTypes = new int[newCapacity];

        if (size > 0) {

            arraycopy(types, 0, newTypes, 0, size);

        }

        types = newTypes;

    }

    // no System.arraycopy

    private void arraycopy(final int[] src, final int srcPos,

                           final int[] dest, final int destPos,

                           final int length) {

        for (int i = 0; i < length; ++i) {

            dest[destPos + i] = src[srcPos + i];

        }

    }

}