Groovy example source code file (ManagedDoubleKeyMap.java)

This example Groovy source code file (ManagedDoubleKeyMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

entry, entry, entrywithvalue, k, k1, k2, manageddoublekeymap, ref, ref, referencebundle, segment, segment, v, v

The Groovy ManagedDoubleKeyMap.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.codehaus.groovy.util;


public class ManagedDoubleKeyMap<K1,K2,V> extends AbstractConcurrentDoubleKeyMap {
    public ManagedDoubleKeyMap(ReferenceBundle bundle) {
        super(bundle);
    }
    
    protected AbstractConcurrentDoubleKeyMap.Segment<K1,K2,V> createSegment(Object segmentInfo, int cap) {
        ReferenceBundle bundle = (ReferenceBundle) segmentInfo;
        return new Segment<K1,K2,V>(bundle, cap);
    }

    static class Segment<K1,K2,V> extends AbstractConcurrentDoubleKeyMap.Segment{
        private ReferenceBundle bundle;
        public Segment(ReferenceBundle bundle, int cap) {
            super(cap);
            this.bundle = bundle;
        }

        protected AbstractConcurrentDoubleKeyMap.Entry<K1,K2,V> createEntry(K1 key1, K2 key2, int hash) {
            return new EntryWithValue(bundle, key1, key2, hash, this);
        }
    }

    static class Ref<K> extends ManagedReference {
        final Entry entry;
        public Ref(ReferenceBundle bundle, K referent, Entry entry) {
            super(bundle, referent);
            this.entry = entry;
        }

        public void finalizeRef() {
            this.entry.clean();
        }
    }

    public static class Entry<K1,K2, V> implements AbstractConcurrentDoubleKeyMap.Entry {
        private final int hash;
        final Ref<K1> ref1;
        final Ref<K2> ref2;
        final Segment segment;

        public Entry(ReferenceBundle bundle, K1 key1, K2 key2, int hash, Segment segment) {
            this.hash = hash;
            this.segment = segment;
            ref1 = new Ref(bundle, key1, this);
            ref2 = new Ref(bundle, key2, this);
        }

        public boolean isValid() {
            return ref1.get() != null && ref2.get () != null;
        }

        public boolean isEqual(K1 key1, K2 key2, int hash) {
            return this.hash == hash && ref1.get() == key1 && ref2.get() == key2;
        }

        public V getValue() {
            return (V)this;
        }

        public void setValue(V value) {
        }

        public int getHash() {
            return hash;
        }

        public void clean() {
            segment.removeEntry(this);
            ref1.clear();
            ref2.clear();
        }
    }

    private static class EntryWithValue<K1,K2,V> extends Entry {
        private V value;

        public EntryWithValue(ReferenceBundle bundle, K1 key1, K2 key2, int hash, Segment segment) {
            super(bundle, key1, key2, hash, segment);
        }

        public V getValue() {
            return value;
        }

        public void setValue(V value) {
            this.value = value;
        }

        public void clean() {
            super.clean();
            value = null;
        }
    }
}