ProvenanceProbMap.java

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/*******************************************************************************
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use these files 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.
 *
 * Copyright 2014 - Juan Pino, Aurelien Waite, William Byrne
 *******************************************************************************/
package uk.ac.cam.eng.extraction.hadoop.datatypes;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableUtils;

public class ProvenanceProbMap implements Writable,
                Map<IntWritable, DoubleWritable> {

        static final ProvenanceProbMap EMPTY = new ProvenanceProbMap() {
                public DoubleWritable put(IntWritable key, DoubleWritable value) {
                        throw new UnsupportedOperationException();
                };
        };

        private Map<IntWritable, DoubleWritable> instance = new HashMap<>();

        public ProvenanceProbMap() {

        }

        public ProvenanceProbMap(ProvenanceProbMap value) {
                for (Entry<IntWritable, DoubleWritable> entry : value.entrySet()) {
                        put(entry.getKey(), entry.getValue());
                }
        }

        public int size() {
                return instance.size();
        }

        public boolean isEmpty() {
                return instance.isEmpty();
        }

        public boolean containsKey(Object key) {
                return instance.containsKey(key);
        }

        public boolean containsValue(Object value) {
                return instance.containsValue(value);
        }

        public DoubleWritable get(Object key) {
                return instance.get(key);
        }

        public DoubleWritable put(IntWritable key, DoubleWritable value) {
                return instance.put(key, value);
        }

        public DoubleWritable put(int key, double value) {
                IntWritable keyObject = IntWritableCache.createIntWritable(key);
                if (instance.containsKey(keyObject) && instance.get(keyObject) != null) {
                        instance.get(keyObject).set(value);
                        return instance.get(keyObject);
                } else {
                        return instance.put(keyObject, new DoubleWritable(value));
                }

        }

        public DoubleWritable remove(Object key) {
                return instance.remove(key);
        }

        public void putAll(Map<? extends IntWritable, ? extends DoubleWritable> m) {
                instance.putAll(m);
        }

        public void clear() {
                instance.clear();
        }

        public Set<IntWritable> keySet() {
                return instance.keySet();
        }

        public Collection<DoubleWritable> values() {
                return instance.values();
        }

        public Set<java.util.Map.Entry<IntWritable, DoubleWritable>> entrySet() {
                return instance.entrySet();
        }

        public boolean equals(Object o) {
                return instance.equals(o);
        }

        public int hashCode() {
                return instance.hashCode();
        }

        public String toString() {
                return instance.toString();
        }

        public void merge(ProvenanceProbMap other) {
                int expectedSize = size() + other.size();
                putAll(other);
                if (expectedSize != size()) {
                        throw new RuntimeException("Two features with the same id: " + this
                                        + " " + other);
                }
        }

        @Override
        public void write(DataOutput out) throws IOException {
                WritableUtils.writeVInt(out, instance.size());
                for (Entry<IntWritable, DoubleWritable> entry : instance.entrySet()) {
                        WritableUtils.writeVInt(out, entry.getKey().get());
                        entry.getValue().write(out);
                }
        }

        @Override
        public void readFields(DataInput in) throws IOException {
                instance.clear();
                int length = WritableUtils.readVInt(in);
                for (int i = 0; i < length; ++i) {
                        int key = WritableUtils.readVInt(in);
                        double value = in.readDouble();
                        put(key, value);
                }

        }

}