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 * Copyright (c) 2004, 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
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 */

package sun.management;

import java.io.Serializable;
import java.util.*;
import javax.management.openmbean.ArrayType;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.CompositeType;
import javax.management.openmbean.OpenType;
import javax.management.openmbean.TabularType;

This abstract class provides the implementation of the CompositeData
interface.  A CompositeData object will be lazily created only when
the CompositeData interface is used.
Classes that extends this abstract class will implement the
getCompositeData() method. The object returned by the
getCompositeData() is an instance of CompositeData such that
the instance serializes itself as the type CompositeDataSupport.
/**
 * This abstract class provides the implementation of the CompositeData
 * interface.  A CompositeData object will be lazily created only when
 * the CompositeData interface is used.
 *
 * Classes that extends this abstract class will implement the
 * getCompositeData() method. The object returned by the
 * getCompositeData() is an instance of CompositeData such that
 * the instance serializes itself as the type CompositeDataSupport.
 */
public abstract class LazyCompositeData
        implements CompositeData, Serializable {

    private CompositeData compositeData;

    // Implementation of the CompositeData interface
    @Override
    public boolean containsKey(String key) {
        return compositeData().containsKey(key);
    }

    @Override
    public boolean containsValue(Object value) {
        return compositeData().containsValue(value);
    }

    @Override
    public boolean equals(Object obj) {
        return compositeData().equals(obj);
    }

    @Override
    public Object get(String key) {
        return compositeData().get(key);
    }

    @Override
    public Object[] getAll(String[] keys) {
        return compositeData().getAll(keys);
    }

    @Override
    public CompositeType getCompositeType() {
        return compositeData().getCompositeType();
    }

    @Override
    public int hashCode() {
        return compositeData().hashCode();
    }

    @Override
    public String toString() {
        /** FIXME: What should this be?? */
        return compositeData().toString();
    }

    @Override
    public Collection<?> values() {
        return compositeData().values();
    }

    /* Lazy creation of a CompositeData object
     * only when the CompositeData interface is used.
     */
    private synchronized CompositeData compositeData() {
        if (compositeData != null)
            return compositeData;
        compositeData = getCompositeData();
        return compositeData;
    }

    
Designate to a CompositeData object when writing to an
output stream during serialization so that the receiver
only requires JMX 1.2 classes but not any implementation
specific class.
/**
     * Designate to a CompositeData object when writing to an
     * output stream during serialization so that the receiver
     * only requires JMX 1.2 classes but not any implementation
     * specific class.
     */
    protected Object writeReplace() throws java.io.ObjectStreamException {
        return compositeData();
    }

    
Returns the CompositeData representing this object.
The returned CompositeData object must be an instance
of javax.management.openmbean.CompositeDataSupport class
so that no implementation specific class is required
for unmarshalling besides JMX 1.2 classes.
/**
     * Returns the CompositeData representing this object.
     * The returned CompositeData object must be an instance
     * of javax.management.openmbean.CompositeDataSupport class
     * so that no implementation specific class is required
     * for unmarshalling besides JMX 1.2 classes.
     */
    protected abstract CompositeData getCompositeData();

    // Helper methods
    public static String getString(CompositeData cd, String itemName) {
        if (cd == null)
            throw new IllegalArgumentException("Null CompositeData");

        return (String) cd.get(itemName);
    }

    public static boolean getBoolean(CompositeData cd, String itemName) {
        if (cd == null)
            throw new IllegalArgumentException("Null CompositeData");

        return ((Boolean) cd.get(itemName));
    }

    public static long getLong(CompositeData cd, String itemName) {
        if (cd == null)
            throw new IllegalArgumentException("Null CompositeData");

        return ((Long) cd.get(itemName));
    }

    public static int getInt(CompositeData cd, String itemName) {
        if (cd == null)
            throw new IllegalArgumentException("Null CompositeData");

        return ((Integer) cd.get(itemName));
    }

    
Compares two CompositeTypes and returns true if
all items in type1 exist in type2 and their item types
are the same.
Params:
type1 – the base composite type
type2 – the checked composite type
Returns:
true if all items in type1 exist in type2 and their item types are the same./**
     * Compares two CompositeTypes and returns true if
     * all items in type1 exist in type2 and their item types
     * are the same.
     * @param type1 the base composite type
     * @param type2 the checked composite type
     * @return {@code true} if all items in type1 exist in type2 and their item
     *         types are the same.
     */
    protected static boolean isTypeMatched(CompositeType type1, CompositeType type2) {
        if (type1 == type2) return true;

        // We can't use CompositeType.isValue() since it returns false
        // if the type name doesn't match.
        Set<String> allItems = type1.keySet();

        // Check all items in the type1 exist in type2
        if (!type2.keySet().containsAll(allItems))
            return false;

        return allItems.stream().allMatch(
            item -> isTypeMatched(type1.getType(item), type2.getType(item))
        );
    }

    protected static boolean isTypeMatched(TabularType type1, TabularType type2) {
        if (type1 == type2) return true;

        List<String> list1 = type1.getIndexNames();
        List<String> list2 = type2.getIndexNames();

        // check if the list of index names are the same
        if (!list1.equals(list2))
            return false;

        return isTypeMatched(type1.getRowType(), type2.getRowType());
    }

    protected static boolean isTypeMatched(ArrayType<?> type1, ArrayType<?> type2) {
        if (type1 == type2) return true;

        int dim1 = type1.getDimension();
        int dim2 = type2.getDimension();

        // check if the array dimensions are the same
        if (dim1 != dim2)
            return false;

        return isTypeMatched(type1.getElementOpenType(), type2.getElementOpenType());
    }

    private static boolean isTypeMatched(OpenType<?> ot1, OpenType<?> ot2) {
        if (ot1 instanceof CompositeType) {
            if (! (ot2 instanceof CompositeType))
                return false;
            if (!isTypeMatched((CompositeType) ot1, (CompositeType) ot2))
                return false;
        } else if (ot1 instanceof TabularType) {
            if (! (ot2 instanceof TabularType))
                return false;
            if (!isTypeMatched((TabularType) ot1, (TabularType) ot2))
                return false;
        } else if (ot1 instanceof ArrayType) {
            if (! (ot2 instanceof ArrayType))
                return false;
            if (!isTypeMatched((ArrayType<?>) ot1, (ArrayType<?>) ot2)) {
                return false;
            }
        } else if (!ot1.equals(ot2)) {
            return false;
        }
        return true;
    }

    private static final long serialVersionUID = -2190411934472666714L;
}