com.ibm.jaql.io.serialization.binary.def.JsonJavaObjectSerializer.java Source code

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Here is the source code for com.ibm.jaql.io.serialization.binary.def.JsonJavaObjectSerializer.java

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/*
 * Copyright (C) IBM Corp. 2008.
 * 
 * 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 com.ibm.jaql.io.serialization.binary.def;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.lang.reflect.UndeclaredThrowableException;

import org.apache.hadoop.io.Writable;

import com.ibm.jaql.io.serialization.binary.BinaryBasicSerializer;
import com.ibm.jaql.json.type.JsonJavaObject;
import com.ibm.jaql.json.type.JsonValue;

class JsonJavaObjectSerializer extends BinaryBasicSerializer<JsonJavaObject> {
    @Override
    public JsonJavaObject read(DataInput in, JsonValue target) throws IOException {
        JsonJavaObject t;
        if (target == null || !(target instanceof JsonJavaObject)) {
            t = new JsonJavaObject();
        } else {
            t = (JsonJavaObject) target;
        }

        String name = in.readUTF();
        Writable o = t.getInternalValue();
        if (o == null || !o.getClass().getName().equals(name)) {
            try {
                Class<?> clazz = Class.forName(name);
                o = (Writable) clazz.newInstance();
                t.set(o);
            } catch (Exception e) {
                throw new UndeclaredThrowableException(e);
            }
        }
        o.readFields(in);

        return t;
    }

    @Override
    public void write(DataOutput out, JsonJavaObject value) throws IOException {
        Writable o = value.getInternalValue();
        out.writeUTF(o.getClass().getName());
        o.write(out);
    }

    //TODO: efficient implementation of compare, skip, and copy
}