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GS Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.

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/*
 * Copyright 2011 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.collections.impl.block.function;

import com.gs.collections.api.block.function.Function;
import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.tuple.Pair;
import com.gs.collections.impl.factory.Lists;
import com.gs.collections.impl.tuple.Tuples;

public class CaseFunction, V> implements Function
{
    private static final long serialVersionUID = 1L;

    private final MutableList, Function>> predicateFunctions = Lists.mutable.of();
    private Function defaultFunction;

    public CaseFunction()
    {
    }

    public CaseFunction(Function newDefaultFunction)
    {
        this.defaultFunction = newDefaultFunction;
    }

    public CaseFunction addCase(
            Predicate predicate,
            Function function)
    {
        this.predicateFunctions.add(Tuples., Function>pair(predicate, function));
        return this;
    }

    public CaseFunction setDefault(Function function)
    {
        this.defaultFunction = function;
        return this;
    }

    public V valueOf(T argument)
    {
        for (Pair, Function> pair : this.predicateFunctions)
        {
            if (pair.getOne().accept(argument))
            {
                return pair.getTwo().valueOf(argument);
            }
        }

        if (this.defaultFunction != null)
        {
            return this.defaultFunction.valueOf(argument);
        }

        return null;
    }

    @Override
    public String toString()
    {
        return "new CaseFunction(" + this.predicateFunctions + ')';
    }
}