com.adaptris.core.services.metadata.Base64DecodeMetadataService.java Source code

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Here is the source code for com.adaptris.core.services.metadata.Base64DecodeMetadataService.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * 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 com.adaptris.core.services.metadata;

import static org.apache.commons.lang.StringUtils.isEmpty;

import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;

import com.adaptris.annotation.AdapterComponent;
import com.adaptris.annotation.ComponentProfile;
import com.adaptris.annotation.DisplayOrder;
import com.adaptris.core.AdaptrisMessage;
import com.adaptris.util.text.Base64ByteTranslator;
import com.adaptris.util.text.ByteTranslator;
import com.thoughtworks.xstream.annotations.XStreamAlias;

/**
 * Base64 decods an item of metadata.
 * <p>
 * Each matching metadata key from {@link ReformatMetadata#getMetadataKeyRegexp()} will be decoded, and the value overwitten with
 * the bytes after translating it into a String with the specified {@link AdaptrisMessage#getContentEncoding()}
 * </p>
 * 
 * @config metadata-base64-decode
 * 
 * 
 * 
 */
@XStreamAlias("metadata-base64-decode")
@AdapterComponent
@ComponentProfile(summary = "Base64 decode an item of metadata", tag = "service,metadata,base64")
@DisplayOrder(order = { "metadataKeyRegexp", "metadataLogger" })
public class Base64DecodeMetadataService extends ReformatMetadata {

    private transient ByteTranslator byteTranslator = new Base64ByteTranslator();

    public Base64DecodeMetadataService() {
        super();
    }

    public Base64DecodeMetadataService(String regexp) {
        super(regexp);
    }

    @Override
    public String reformat(String s, String charEncoding) throws Exception {
        byte[] debased = byteTranslator.translate(s);
        return toString(debased, charEncoding);
    }

    private String toString(byte[] metadataValue, String charset) throws UnsupportedEncodingException {
        Charset cset = Charset.defaultCharset();
        if (!isEmpty(charset)) {
            cset = Charset.forName(charset);
        }
        return cset.decode(ByteBuffer.wrap(metadataValue)).toString();
    }

}