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/**
 * Copyright 2017 Goldman Sachs.
 * 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.gs.obevo.util.vfs;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.nio.charset.Charset;

import com.ibm.icu.text.CharsetDetector;
import com.ibm.icu.text.CharsetMatch;

/**
 * Charset detector using the icu4j library.
 */
class DetectCharsetStrategy implements CharsetStrategy {
    @Override
    public Charset determineCharset(byte[] bytes) {
        try (ByteArrayInputStream input = new ByteArrayInputStream(bytes)) {
            CharsetDetector cd = new CharsetDetector();
            cd.setText(input);
            CharsetMatch cm = cd.detect();
            return Charset.forName(cm.getName());
        } catch (IOException e) {
            return null;
        }
    }
}