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/*******************************************************************************
 * Copyright 2012 Anteros Tecnologia
 *  
 * 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 br.com.anteros.bean.validation.util.translate;

import java.io.IOException;
import java.io.Writer;

/**
 * Helper subclass to CharSequenceTranslator to remove unpaired surrogates.
 * 
 * @version $Id: UnicodeUnpairedSurrogateRemover.java 1568639 2014-02-15 16:13:27Z britter $
 */
public class UnicodeUnpairedSurrogateRemover extends CodePointTranslator {
    /**
     * Implementation of translate that throws out unpaired surrogates. 
     * {@inheritDoc}
     */
    @Override
    public boolean translate(int codepoint, Writer out) throws IOException {
        if (codepoint >= Character.MIN_SURROGATE && codepoint <= Character.MAX_SURROGATE) {
            // It's a surrogate. Write nothing and say we've translated.
            return true;
        } else {
            // It's not a surrogate. Don't translate it.
            return false;
        }
    }
}