com.shigengyu.hyperion.core.WorkflowTransitionSet.java Source code

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/*******************************************************************************
 * Copyright 2013-2014 Gengyu Shi
 *
 * 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.shigengyu.hyperion.core;

import java.util.Iterator;
import java.util.List;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

public class WorkflowTransitionSet implements Iterable<WorkflowTransition> {

    public static WorkflowTransitionSet copyOf(Iterable<WorkflowTransition> transitions) {
        return new WorkflowTransitionSet(ImmutableList.copyOf(transitions));
    }

    public static WorkflowTransitionSet empty() {
        return new WorkflowTransitionSet(ImmutableList.<WorkflowTransition>of());
    }

    private final ImmutableList<WorkflowTransition> transitions;

    private WorkflowTransitionSet(ImmutableList<WorkflowTransition> transitions) {
        this.transitions = transitions;
    }

    public final WorkflowTransitionSet filter(Predicate<WorkflowTransition> predicate) {
        List<WorkflowTransition> filtered = Lists.newArrayList();
        for (WorkflowTransition transition : transitions) {
            if (predicate.apply(transition)) {
                filtered.add(transition);
            }
        }
        return WorkflowTransitionSet.copyOf(filtered);
    }

    public final WorkflowTransitionSet filter(String transitionName) {
        List<WorkflowTransition> list = Lists.newArrayList();
        for (WorkflowTransition transition : transitions) {
            if (transition.getName().equals(transitionName)) {
                list.add(transition);
            }
        }
        return new WorkflowTransitionSet(ImmutableList.copyOf(list));
    }

    public final WorkflowTransitionSet filter(WorkflowStateSet fromStates) {
        List<WorkflowTransition> list = Lists.newArrayList();
        for (WorkflowTransition transition : transitions) {
            if (transition.getFromStates().isSubSetOf(fromStates)) {
                list.add(transition);
            }
        }
        return new WorkflowTransitionSet(ImmutableList.copyOf(list));
    }

    public final WorkflowTransition get(int index) {
        return transitions.get(index);
    }

    public final WorkflowTransitionSet getAutoTransitions() {
        return filter(new Predicate<WorkflowTransition>() {

            @Override
            public boolean apply(WorkflowTransition input) {
                return input.isAuto();
            }
        });
    }

    public final boolean isEmpty() {
        return transitions.isEmpty();
    }

    @Override
    public Iterator<WorkflowTransition> iterator() {
        return transitions.iterator();
    }

    public final int size() {
        return transitions.size();
    }
}