ch.piratenpartei.pivote.serialize.handlers.MapHandler.java Source code

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Here is the source code for ch.piratenpartei.pivote.serialize.handlers.MapHandler.java

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/*
 * Copyright 2012 Piratenpartei Schweiz
 *
 * 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 ch.piratenpartei.pivote.serialize.handlers;

import java.io.IOException;
import java.util.Map;

import ch.piratenpartei.pivote.serialize.DataIO;
import ch.piratenpartei.pivote.serialize.DataInput;
import ch.piratenpartei.pivote.serialize.DataOutput;
import ch.piratenpartei.pivote.serialize.Handler;
import com.google.common.collect.ImmutableMap;

/**
 * @author <a href="mailto:herzog@raffael.ch">Raffael Herzog</a>
 */
public class MapHandler implements Handler {

    private final Handler keyHandler;
    private final Handler valueHandler;

    public MapHandler(Handler keyHandler, Handler valueHandler) {
        this.keyHandler = keyHandler;
        this.valueHandler = valueHandler;
    }

    @Override
    public Object read(DataInput input) throws IOException {
        ImmutableMap.Builder<Object, Object> builder = ImmutableMap.builder();
        int size = input.readInt32();
        for (int i = 0; i < size; i++) {
            builder.put(keyHandler.read(input), valueHandler.read(input));
        }
        return builder.build();
    }

    @Override
    public void write(DataOutput output, Object value) throws IOException {
        Map<?, ?> map = DataIO.check(Map.class, value);
        output.writeInt32(map.size());
        for (Map.Entry<?, ?> entry : map.entrySet()) {
            keyHandler.write(output, entry.getKey());
            valueHandler.write(output, entry.getValue());
        }
    }
}