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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.util;

/**
 * This {@link StringFunction} tests whether the first given {@link StringFunction}
 * returns null, returning the result of the latter function if so,
 * or null otherwise.
 *
 * @author Eric Lafortune
 */
public class AndNotStringFunction implements StringFunction
{
    private final StringFunction stringFunction1;
    private final StringFunction stringFunction2;


    /**
     * Creates a new AndNotStringFunction with the two given string functions.
     */
    public AndNotStringFunction(StringFunction stringFunction1,
                                StringFunction stringFunction2)
    {
        this.stringFunction1 = stringFunction1;
        this.stringFunction2 = stringFunction2;
    }


    // Implementations for StringFunction.

    @Override
    public String transform(String string)
    {
        return stringFunction1.transform(string) != null ? null :
               stringFunction2.transform(string);
    }
}