/**
* ZLibUtils.java
*
* Copyright 2011 Niolex, Inc.
*
* Niolex 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.niolex.commons.compress;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.InflaterOutputStream;
import org.apache.niolex.commons.codec.StringUtil;
import org.apache.niolex.commons.internal.Finally;
import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.type.JavaType;
/**
* ZLib压缩工具
*
* @author <a href="mailto:xiejiyun@gmail.com">Xie, Jiyun</a>
* @version 1.0
* @since 1.0
*/
public abstract class ZLibUtil {
/**
* 压缩
*
* @param data
* 待压缩数据
* @return byte[] 压缩后的数据
* @throws IOException
*/
public static byte[] compress(byte[] data) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
DeflaterOutputStream zout = new DeflaterOutputStream(out);
Finally.writeAndClose(zout, data);
return out.toByteArray();
}
/**
* 解压缩
*
* @param data
* 待压缩的数据
* @return byte[] 解压缩后的数据
* @throws IOException
*/
public static byte[] decompress(byte[] data) throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
InflaterOutputStream zos = new InflaterOutputStream(bos);
Finally.writeAndClose(zos, data);
return bos.toByteArray();
}
/**
* 压缩字符串
*
* @param str
* @return 压缩后的数据
* @throws IOException
*/
public static final byte[] compressString(String str) throws IOException {
byte[] data = str.getBytes(StringUtil.UTF_8);
return compress(data);
}
/**
* 解压缩字符串
*
* @param data
* @return 解压后的字符串
* @throws IOException
*/
public static final String decompressString(byte[] data) throws IOException {
data = decompress(data);
return new String(data, StringUtil.UTF_8);
}
/**
* 压缩对象，使用Json作为内部表现形式
*
* @param value
* @return the compressed data
* @throws IOException
*/
public static byte[] compressObj(Object value) throws IOException {
return compress(JacksonUtil.obj2bin(value));
}
/**
* 解压缩对象
*
* @param <T>
* @param data
* @param valueType
* @return the object
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
public static final <T> T decompressObj(byte[] data, Class<T> valueType) throws JsonParseException, JsonMappingException,
IOException {
return JacksonUtil.bin2Obj(decompress(data), valueType);
}
/**
* 解压缩对象
*
* @param <T>
* @param data
* @param valueType
* @return the object
* @throws JsonParseException
* @throws JsonMappingException
* @throws IOException
*/
@SuppressWarnings("unchecked")
public static final <T> T decompressObj(byte[] data, JavaType valueType) throws JsonParseException, JsonMappingException,
IOException {
return (T)JacksonUtil.bin2Obj(decompress(data), valueType);
}
}