/*
 * Copyright (c) 2019, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.
 *
 * WSO2 Inc. licenses this file to you 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.wso2.carbon.inbound.endpoint.protocol.jms;

import org.apache.axiom.attachments.SizeAwareDataSource;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import javax.jms.BytesMessage;
import javax.jms.JMSException;

/**
 * Data source implementation wrapping a JMS {@link javax.jms.BytesMessage}.
 * <p>
 * Note that two input streams created by the same instance of this
 * class can not be used at the same time.
 */
public class BytesMessageDataSource implements SizeAwareDataSource {
    private final BytesMessage message;
    private final String contentType;

    public BytesMessageDataSource(BytesMessage message, String contentType) {
        this.message = message;
        this.contentType = contentType;
    }

    public BytesMessageDataSource(BytesMessage message) {
        this(message, "application/octet-stream");
    }

    public long getSize() {
        try {
            return message.getBodyLength();
        } catch (JMSException ex) {
            throw new RuntimeException(ex);
        }
    }

    public String getContentType() {
        return contentType;
    }

    public InputStream getInputStream() throws IOException {
        try {
            message.reset();
        } catch (JMSException ex) {
            throw new JMSExceptionWrapper(ex);
        }
        return new BytesMessageInputStream(message);
    }

    public String getName() {
        return null;
    }

    public OutputStream getOutputStream() throws IOException {
        throw new UnsupportedOperationException();
    }
}
