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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 2013 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.partition.stack;

import com.gs.collections.api.block.predicate.Predicate;
import com.gs.collections.api.block.predicate.Predicate2;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.list.MutableList;
import com.gs.collections.api.partition.stack.PartitionImmutableStack;
import com.gs.collections.api.partition.stack.PartitionMutableStack;
import com.gs.collections.api.stack.MutableStack;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.stack.mutable.ArrayStack;

public class PartitionArrayStack implements PartitionMutableStack
{
    private final MutableList selected = FastList.newList();
    private final MutableList rejected = FastList.newList();

    public MutableStack getSelected()
    {
        return ArrayStack.newStackFromTopToBottom(this.selected);
    }

    public MutableStack getRejected()
    {
        return ArrayStack.newStackFromTopToBottom(this.rejected);
    }

    public PartitionImmutableStack toImmutable()
    {
        return new PartitionImmutableStackImpl(this);
    }

    public void add(T t)
    {
        throw new UnsupportedOperationException("add is no longer supported for PartitionArrayStack");
    }

    public static final class PartitionProcedure implements Procedure
    {
        private static final long serialVersionUID = 1L;

        private final Predicate predicate;
        private final PartitionArrayStack partitionMutableStack;

        public PartitionProcedure(Predicate predicate, PartitionArrayStack partitionMutableStack)
        {
            this.predicate = predicate;
            this.partitionMutableStack = partitionMutableStack;
        }

        public void value(T each)
        {
            MutableList bucket = this.predicate.accept(each)
                    ? this.partitionMutableStack.selected
                    : this.partitionMutableStack.rejected;
            bucket.add(each);
        }
    }

    public static final class PartitionPredicate2Procedure implements Procedure
    {
        private static final long serialVersionUID = 1L;

        private final Predicate2 predicate;
        private final P parameter;
        private final PartitionArrayStack partitionMutableStack;

        public PartitionPredicate2Procedure(Predicate2 predicate, P parameter, PartitionArrayStack partitionMutableStack)
        {
            this.predicate = predicate;
            this.parameter = parameter;
            this.partitionMutableStack = partitionMutableStack;
        }

        public void value(T each)
        {
            MutableList bucket = this.predicate.accept(each, this.parameter)
                    ? this.partitionMutableStack.selected
                    : this.partitionMutableStack.rejected;
            bucket.add(each);
        }
    }
}