org.fabric3.spi.container.invocation.CallbackReferenceSerializer Maven / Gradle / Ivy

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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.fabric3.spi.container.invocation;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.fabric3.api.host.Fabric3Exception;

/**
 * Serializes and (De)Serializes a callback reference to a byte array or String.
 */
public class CallbackReferenceSerializer {

    public static String serializeToString(List references) {
        StringBuilder builder = new StringBuilder();
        boolean first = true;
        for (String reference : references) {
            if (first) {
                builder.append(reference);
                first = false;
            } else {
                builder.append(",").append(reference);
            }
        }
        return builder.toString();
    }

    public static byte[] serializeToBytes(List references) throws Fabric3Exception {
        try {
            ByteArrayOutputStream bas = new ByteArrayOutputStream();
            DataOutputStream das = new DataOutputStream(bas);
            das.writeInt(references.size());
            for (String reference : references) {
                das.writeInt(reference.length());
                das.write(reference.getBytes());
            }
            return bas.toByteArray();
        } catch (IOException e) {
            throw new Fabric3Exception(e);
        }
    }

    @SuppressWarnings("ResultOfMethodCallIgnored")
    public static List deserialize(byte[] bytes) throws Fabric3Exception {
        try {
            ByteArrayInputStream bis = new ByteArrayInputStream(bytes);
            DataInputStream dis = new DataInputStream(bis);
            int number = dis.readInt();
            List references = new ArrayList<>(number);
            while (number > 0) {
                String callbackReference = null;
                int callbackUriSize = dis.readInt();
                if (callbackUriSize > 0) {
                    byte[] uriBytes = new byte[callbackUriSize];
                    dis.read(uriBytes);
                    callbackReference = new String(uriBytes);
                }
                references.add(callbackReference);
                number--;
            }
            return references;
        } catch (IOException e) {
            throw new Fabric3Exception(e);
        }
    }

    public static List deserialize(String serialized) {
        List references = new ArrayList<>();
        String[] tokens = serialized.split(",");
        Collections.addAll(references, tokens);
        return references;
    }

}