com.adaptris.core.services.transcoding.DecodingService.java Source code

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Here is the source code for com.adaptris.core.services.transcoding.DecodingService.java

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/*
 * Copyright 2015 Adaptris Ltd.
 *
 * 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.adaptris.core.services.transcoding;

import java.io.InputStream;
import java.io.OutputStream;

import org.apache.commons.lang.BooleanUtils;

import com.adaptris.annotation.AdapterComponent;
import com.adaptris.annotation.ComponentProfile;
import com.adaptris.annotation.InputFieldDefault;
import com.adaptris.core.AdaptrisMessage;
import com.adaptris.core.AdaptrisMessageEncoder;
import com.adaptris.core.MetadataElement;
import com.adaptris.core.ServiceException;
import com.adaptris.util.stream.StreamUtil;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * Decodes the payload and updates the in flight message with the decoded output.
 *
 * @config decoding-service
 *
 */
@XStreamAlias("decoding-service")
@AdapterComponent
@ComponentProfile(summary = "Decodes the message", tag = "service")
public class DecodingService extends TranscodingService {

    @InputFieldDefault(value = "false")
    private Boolean overrideMetadata;

    public DecodingService() {
    }

    public DecodingService(AdaptrisMessageEncoder encoder) {
        super(encoder);
    }

    @Override
    public void transcodeMessage(AdaptrisMessage msg) throws ServiceException {
        try (InputStream msgIn = msg.getInputStream(); OutputStream msgOut = msg.getOutputStream()) {
            AdaptrisMessage decodedMsg = getEncoder().readMessage(msgIn);
            for (MetadataElement me : decodedMsg.getMetadata()) {
                if (!isOverrideMetadata() && msg.headersContainsKey(me.getKey())) {
                    continue;
                }
                msg.addMetadata(me);
            }
            StreamUtil.copyAndClose(decodedMsg.getInputStream(), msgOut);
        } catch (Exception e) {
            throw new ServiceException(e);
        }
    }

    boolean isOverrideMetadata() {
        return BooleanUtils.toBooleanDefaultIfNull(getOverrideMetadata(), false);
    }

    public Boolean getOverrideMetadata() {
        return this.overrideMetadata;
    }

    /**
     * Set boolean value to control the overriding of metadata.
     *
     * <p>If true metadata when a metadata key from the decoded message has the same key as metadata in the in flight message it will be replaced with the value of the decoded one.</p>
     *
     * @param overrideMetadata Boolean value to control overriding of metadata.
     */
    public void setOverrideMetadata(Boolean overrideMetadata) {
        this.overrideMetadata = overrideMetadata;
    }

}