com.shigengyu.hyperion.core.WorkflowTransition.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.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.apache.commons.lang.StringUtils;

public class WorkflowTransition {

    private final boolean auto;
    private final TransitionConditionSet conditions;
    private final boolean dynamic;
    private final WorkflowStateSet fromStates;
    private final boolean hidden;
    private final int maxEntry;
    private final Method method;
    private final boolean multiEntry;
    private final String name;
    private final StateTransitionStyle stateTransitionStyle;
    private final TransitionCompensationList transitionCompensations;

    private final WorkflowStateSet toStates;

    public WorkflowTransition(Method method, Transition transition, TransitionShared transitionShared) {
        this.method = method;
        String transitionName = transition.override() ? transition.name() : transitionShared.name();
        if (StringUtils.isEmpty(transitionName)) {
            transitionName = method.getName();
        }
        name = transitionName;

        auto = transition.override() ? transition.auto() : transitionShared.auto();
        hidden = transition.override() ? transition.hidden() : transitionShared.hidden();
        multiEntry = transition.override() ? transition.multiEntry() : transitionShared.multiEntry();
        maxEntry = transition.override() ? transition.maxEntry() : transitionShared.maxEntry();
        stateTransitionStyle = transition.override() ? transition.stateTransitionStyle()
                : transitionShared.stateTransitionStyle();

        fromStates = WorkflowStateSet
                .from(transition.override() ? transition.fromStates() : transitionShared.fromStates());
        WorkflowStateSet specifiedToStates = WorkflowStateSet
                .from(transition.override() ? transition.toStates() : transitionShared.toStates());
        toStates = specifiedToStates.size() > 0 ? specifiedToStates : fromStates;

        conditions = TransitionConditionSet
                .from(transition.override() ? transition.conditions() : transitionShared.conditions());

        if (method.getReturnType() == WorkflowStateSet.class) {
            dynamic = true;
        } else if (method.getReturnType() == Void.TYPE) {
            dynamic = false;
        } else {
            throw new WorkflowTransitionException(
                    "Transition method return type cannot be other types other than [{}]",
                    WorkflowStateSet.class.getName());
        }

        transitionCompensations = TransitionCompensationList.from(transition.compensations());
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        WorkflowTransition other = (WorkflowTransition) obj;
        if (auto != other.auto) {
            return false;
        }
        if (conditions == null) {
            if (other.conditions != null) {
                return false;
            }
        } else if (!conditions.equals(other.conditions)) {
            return false;
        }
        if (dynamic != other.dynamic) {
            return false;
        }
        if (fromStates == null) {
            if (other.fromStates != null) {
                return false;
            }
        } else if (!fromStates.equals(other.fromStates)) {
            return false;
        }
        if (hidden != other.hidden) {
            return false;
        }
        if (maxEntry != other.maxEntry) {
            return false;
        }
        if (method == null) {
            if (other.method != null) {
                return false;
            }
        } else if (!method.equals(other.method)) {
            return false;
        }
        if (multiEntry != other.multiEntry) {
            return false;
        }
        if (name == null) {
            if (other.name != null) {
                return false;
            }
        } else if (!name.equals(other.name)) {
            return false;
        }
        if (stateTransitionStyle != other.stateTransitionStyle) {
            return false;
        }
        if (toStates == null) {
            if (other.toStates != null) {
                return false;
            }
        } else if (!toStates.equals(other.toStates)) {
            return false;
        }
        return true;
    }

    public TransitionConditionSet getConditions() {
        return conditions;
    }

    public WorkflowStateSet getFromStates() {
        return fromStates;
    }

    public int getMaxEntry() {
        return maxEntry;
    }

    public String getName() {
        return name;
    }

    public StateTransitionStyle getStateTransitionStyle() {
        return stateTransitionStyle;
    }

    public WorkflowStateSet getToStates() {
        return toStates;
    }

    public final TransitionCompensationList getTransitionCompensations() {
        return transitionCompensations;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + (auto ? 1231 : 1237);
        result = prime * result + (conditions == null ? 0 : conditions.hashCode());
        result = prime * result + (dynamic ? 1231 : 1237);
        result = prime * result + (fromStates == null ? 0 : fromStates.hashCode());
        result = prime * result + (hidden ? 1231 : 1237);
        result = prime * result + maxEntry;
        result = prime * result + (method == null ? 0 : method.hashCode());
        result = prime * result + (multiEntry ? 1231 : 1237);
        result = prime * result + (name == null ? 0 : name.hashCode());
        result = prime * result + (stateTransitionStyle == null ? 0 : stateTransitionStyle.hashCode());
        result = prime * result + (toStates == null ? 0 : toStates.hashCode());
        return result;
    }

    public WorkflowStateSet invoke(WorkflowInstance workflowInstance) {
        try {
            if (method.getParameterTypes().length == 0) {
                return (WorkflowStateSet) method.invoke(workflowInstance.getWorkflowDefinition());
            } else if (method.getParameterTypes().length == 1
                    && method.getParameterTypes()[0] == WorkflowInstance.class) {
                return (WorkflowStateSet) method.invoke(workflowInstance.getWorkflowDefinition(), workflowInstance);
            } else {
                throw new WorkflowExecutionException(
                        "Workflow transition must take one parameter of type WorkflowInstance or no parameters");
            }
        } catch (InvocationTargetException e) {
            Throwable t = e;
            do {
                t = t.getCause();
            } while (t instanceof InvocationTargetException);

            throw new TransitionInvocationException(t);
        } catch (Exception e) {
            throw new WorkflowExecutionException(e);
        }
    }

    public boolean isAuto() {
        return auto;
    }

    public boolean isDynamic() {
        return dynamic;
    }

    public boolean isHidden() {
        return hidden;
    }

    public boolean isMultiEntry() {
        return multiEntry;
    }

    @Override
    public String toString() {
        return name;
    }
}