/*

 * Copyright (c) 2007, 2008, 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 com.sun.tools.classfile;

import java.io.IOException;

import java.util.Arrays;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

/*

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class Attributes implements Iterable<Attribute> {

    public final Attribute[] attrs;

    public final Map<String, Attribute> map;

    Attributes(ClassReader cr) throws IOException {

        map = new HashMap<>();

        int attrs_count = cr.readUnsignedShort();

        attrs = new Attribute[attrs_count];

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

            Attribute attr = Attribute.read(cr);

            attrs[i] = attr;

            try {

                map.put(attr.getName(cr.getConstantPool()), attr);

            } catch (ConstantPoolException e) {

                // don't enter invalid names in map

            }

        }

    }

    public Attributes(ConstantPool constant_pool, Attribute[] attrs) {

        this.attrs = attrs;

        map = new HashMap<>();

        for (Attribute attr : attrs) {

            try {

                map.put(attr.getName(constant_pool), attr);

            } catch (ConstantPoolException e) {

                // don't enter invalid names in map

            }

        }

    }

    public Attributes(Map<String, Attribute> attributes) {

        this.attrs = attributes.values().toArray(new Attribute[attributes.size()]);

        map = attributes;

    }

    public Iterator<Attribute> iterator() {

        return Arrays.asList(attrs).iterator();

    }

    public Attribute get(int index) {

        return attrs[index];

    }

    public Attribute get(String name) {

        return map.get(name);

    }

    public int getIndex(ConstantPool constant_pool, String name) {

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

            Attribute attr = attrs[i];

            try {

                if (attr != null && attr.getName(constant_pool).equals(name))

                    return i;

            } catch (ConstantPoolException e) {

                // ignore invalid entries

            }

        }

        return -1;

    }

    public int size() {

        return attrs.length;

    }

    public int byteLength() {

        int length = 2;

        for (Attribute a: attrs)

            length += a.byteLength();

        return length;

    }

}