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Apache Commons Text is a library focused on algorithms working on strings.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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.commons.text.translate;

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

/**
 * Abstract translator for processing whole input in single pass.
 * Handles initial index checking and counting of returned code points.
 */
abstract class SinglePassTranslator extends CharSequenceTranslator {

    /**
     * A utility method to be used in the {@link #translate(CharSequence, int, Writer)} method.
     *
     * @return The name of this or the extending class.
     */
    private String getClassName() {
        final Class clazz = this.getClass();
        return clazz.isAnonymousClass() ?  clazz.getName() : clazz.getSimpleName();
    }

    /**
     * {@inheritDoc}
     * @throws IllegalArgumentException if {@code index != 0}
     */
    @Override
    public int translate(final CharSequence input, final int index, final Writer writer) throws IOException {
        if (index != 0) {
            throw new IllegalArgumentException(getClassName() + ".translate(final CharSequence input, final int "
                    + "index, final Writer out) cannot handle a non-zero index.");
        }

        translateWhole(input, writer);

        return Character.codePointCount(input, index, input.length());
    }

    /**
     * Translates whole set of code points passed in input.
     *
     * @param input CharSequence that is being translated
     * @param writer Writer to translate the text to
     * @throws IOException if and only if the Writer produces an IOException
     */
    abstract void translateWhole(CharSequence input, Writer writer) throws IOException;
}