org.apache.axiom.util.activation.EmptyDataSource Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.axiom.util.activation;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.axiom.ext.activation.SizeAwareDataSource;
/**
* A data source with empty (zero length) content.
*/
public class EmptyDataSource implements SizeAwareDataSource {
/**
* Empty data source instance with content type application/octet-stream.
*/
public static final EmptyDataSource INSTANCE = new EmptyDataSource("application/octet-stream");
private static final InputStream emptyInputStream = new InputStream() {
public int read() throws IOException {
return -1;
}
};
private final String contentType;
/**
* Construct an empty data source with the given content type.
*
* @param contentType the content type
*/
public EmptyDataSource(String contentType) {
this.contentType = contentType;
}
public String getContentType() {
return contentType;
}
public String getName() {
return null;
}
public long getSize() {
return 0;
}
public InputStream getInputStream() throws IOException {
return emptyInputStream;
}
public OutputStream getOutputStream() throws IOException {
throw new UnsupportedOperationException();
}
}