mimemessageavalonsource.java

java 开发的邮件服务器平台。支持以下协议。 协议可以修改为自己的专门标识

/***********************************************************************
 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * 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.apache.james.mailrepository;

import org.apache.avalon.cornerstone.services.store.StreamRepository;
import org.apache.james.core.MimeMessageSource;

import java.io.IOException;
import java.io.InputStream;

public class MimeMessageAvalonSource extends MimeMessageSource {

    //Define how to get to the data
    
    /**
     * The stream repository used by this data source.
     */
    StreamRepository sr = null;

    /**
     * The name of the repository
     */
    String repositoryName = null;

    /**
     * The key for the particular stream in the stream repository
     * to be used by this data source.
     */
    String key = null;

    private long size = -1;

    public MimeMessageAvalonSource(StreamRepository sr, String repositoryName, String key) {
        this.sr = sr;
        this.repositoryName = repositoryName;
        this.key = key;
    }

    /**
     * Returns a unique String ID that represents the location from where 
     * this source is loaded.  This will be used to identify where the data 
     * is, primarily to avoid situations where this data would get overwritten.
     *
     * @return the String ID
     */
    public String getSourceId() {
        StringBuffer sourceIdBuffer =
            new StringBuffer(128)
                    .append(repositoryName)
                    .append("/")
                    .append(key);
        return sourceIdBuffer.toString();
    }

    public InputStream getInputStream() throws IOException {
        return sr.get(key);
    }

    public long getMessageSize() throws IOException {
        if (size == -1) {
            if (sr instanceof org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) {
                size = ((org.apache.james.mailrepository.filepair.File_Persistent_Stream_Repository) sr).getSize(key);
            } else size = super.getMessageSize();
        }
        return size;
    }
}