/*
 * Copyright 2001-2004 The Apache Software Foundation.
 * 
 * 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.axis.attachments;

import javax.activation.DataSource;
import javax.xml.transform.stream.StreamSource;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.BufferedReader;
import java.io.BufferedInputStream;
import java.net.URL;

public class SourceDataSource implements DataSource {
    public static final String CONTENT_TYPE = "text/xml";

    private final String name;
    private final String contentType;
    private byte[] data;
    private ByteArrayOutputStream os;

    public SourceDataSource(String name, StreamSource data) {
        this(name, CONTENT_TYPE, data);
    } // ctor

    public SourceDataSource(String name, String contentType, StreamSource data) {
        this.name = name;
        this.contentType = contentType == null ? CONTENT_TYPE : contentType;
        os = new ByteArrayOutputStream();
        try {
            if (data != null) {
                // Try the Reader first
                Reader reader = data.getReader();
                if (reader != null) {
                    reader = new BufferedReader(reader);
                    int ch;
                    while ((ch = reader.read())!=-1) {
                        os.write(ch);
                    }
                } else {
                    // Try the InputStream
                    InputStream is = data.getInputStream();
                    if (is == null) {
                        // Try the URL
                        String id = data.getSystemId();
                        if (id != null) {
                            URL url = new URL(id);
                            is = url.openStream();
                        }
                    }
                    if (is != null) {
                        is = new BufferedInputStream(is);
                        // If reading from a socket or URL, we could get a partial read.
                        byte[] bytes = null;
                        int avail;
                        while ((avail = is.available()) > 0) {
                            if (bytes == null || avail > bytes.length)
                                bytes = new byte[avail];
                            is.read(bytes, 0, avail);
                            os.write(bytes, 0, avail);
                        }
                    }
                }
            }
        } catch (Exception e) {
            // Is this sufficient?
        }
    } // ctor

    public String getName() {
        return name;
    } // getName

    public String getContentType() {
        return contentType;
    } // getContentType

    public InputStream getInputStream() throws IOException {
        if (os.size() != 0) {
            data = os.toByteArray();
            os.reset();
        }
        return new ByteArrayInputStream(data == null ? new byte[0] : data);
    } // getInputStream

    public OutputStream getOutputStream() throws IOException {
        if (os.size() != 0) {
            data = os.toByteArray();
            os.reset();
        }
        return os;
    } // getOutputStream
} // class SourceDataSource