/*
* Copyright 2002-2014 the original author or authors.
*
* 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.springframework.integration.transformer;
import org.springframework.util.Assert;
/**
* A simple transformer that creates an outbound payload by invoking the
* inbound payload Object's <code>toString()</code> method. Unless the
* payload is a <code>byte[]</code> or <code>char[]</code>. If the payload
* is a byte[], it will be transformed to a String containing the
* array's contents, using the {@link #charset}
* which, by default, is "UTF-8". If the payload is a char[], it will be
* transformed to a String object with the array's contents.
*
* @author Mark Fisher
* @author Andrew Cowlin
* @author Gary Russell
* @since 1.0.1
*/
public class ObjectToStringTransformer extends AbstractPayloadTransformer<Object, String> {
private final String charset;
public ObjectToStringTransformer() {
this.charset = "UTF-8";
}
public ObjectToStringTransformer(String charset) {
Assert.notNull(charset, "'charset' cannot be null");
this.charset = charset;
}
@Override
public String getComponentType() {
return "object-to-string-transformer";
}
@Override
protected String transformPayload(Object payload) throws Exception {
if (payload instanceof byte[]) {
return new String((byte[]) payload, this.charset);
}
else if (payload instanceof char[]) {
return new String((char[]) payload);
}
else {
return payload.toString();
}
}
}