/*
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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jbpm.pvm.internal.type;
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import java.io.Serializable;
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import org.jbpm.api.JbpmException;
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import org.jbpm.pvm.internal.env.EnvironmentImpl;
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import org.jbpm.pvm.internal.history.HistoryEvent;
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import org.jbpm.pvm.internal.history.HistorySession;
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import org.jbpm.pvm.internal.history.events.VariableUpdate;
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import org.jbpm.pvm.internal.model.ExecutionImpl;
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import org.jbpm.pvm.internal.model.ScopeInstanceImpl;
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import org.jbpm.pvm.internal.task.TaskImpl;
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/**
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* is a jbpm-internal class that serves as a base class for classes
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* that store variable values in the database.
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*/
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public abstract class Variable implements Serializable {
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private static final long serialVersionUID = 1L;
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protected long dbid = -1;
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protected int dbversion = 0;
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protected String key = null;
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protected Converter converter = null;
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protected String textValue = null;
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protected boolean isHistoryEnabled = false;
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protected ExecutionImpl execution;
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protected TaskImpl task;
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// constructors /////////////////////////////////////////////////////////////
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// abstract methods /////////////////////////////////////////////////////////
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/**
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* is true if this variable-instance supports the given value, false otherwise.
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*/
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public abstract boolean isStorable(Object value);
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/**
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* is the value, stored by this variable instance.
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*/
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protected abstract Object getObject();
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/**
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* stores the value in this variable instance.
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*/
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protected abstract void setObject(Object value);
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// variable management //////////////////////////////////////////////////////
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public boolean supports(Object value, ScopeInstanceImpl scopeInstance) {
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if (converter!=null) {
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return converter.supports(value, scopeInstance, this);
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}
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return isStorable(value);
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}
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public void setValue(Object value, ScopeInstanceImpl scopeInstance) {
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if (converter!=null) {
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if (! converter.supports(value, scopeInstance, this)) {
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throw new JbpmException("the converter '"+converter.getClass().getName()+"' in variable instance '"+this.getClass().getName()+"' does not support values of type '"+value.getClass().getName()+"'. to change the type of a variable, you have to delete it first");
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}
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value = converter.convert(value, scopeInstance, this);
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}
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if ( (value!=null)
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&& (! this.isStorable(value)) ) {
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throw new JbpmException("variable instance '"+this.getClass().getName()+"' does not support values of type '"+value.getClass().getName()+"'. to change the type of a variable, you have to delete it first");
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}
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setObject(value);
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HistorySession historySession = EnvironmentImpl.getFromCurrent(HistorySession.class, false);
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if ( isHistoryEnabled
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&& (historySession!=null)
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) {
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HistoryEvent.fire(new VariableUpdate(this));
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}
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}
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public Object getValue(ScopeInstanceImpl scopeInstance) {
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Object value = getObject();
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if ( (value!=null)
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&& (converter!=null) ) {
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value = converter.revert(value, scopeInstance, this);
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}
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return value;
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}
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// utility methods /////////////////////////////////////////////////////////
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public String toString() {
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return "${"+key+"}";
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}
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public Type getType() {
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Type type = new Type();
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type.setConverter(converter);
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type.setVariableClass(getClass());
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return type;
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}
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public ExecutionImpl getProcessInstance() {
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return (execution!=null ? execution.getProcessInstance() : null);
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}
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// getters and setters //////////////////////////////////////////////////////
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public String getKey() {
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return key;
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}
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public long getDbid() {
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return dbid;
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}
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public Converter getConverter() {
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return converter;
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}
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public void setConverter(Converter converter) {
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this.converter = converter;
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}
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public void setKey(String key) {
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this.key = key;
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}
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public String getTextValue() {
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return textValue;
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}
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public ExecutionImpl getExecution() {
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return execution;
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}
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public void setExecution(ExecutionImpl execution) {
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this.execution = execution;
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}
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public TaskImpl getTask() {
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return task;
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}
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public void setTask(TaskImpl task) {
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this.task = task;
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}
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public boolean isHistoryEnabled() {
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return isHistoryEnabled;
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}
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public void setHistoryEnabled(boolean isHistoryEnabled) {
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this.isHistoryEnabled = isHistoryEnabled;
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}
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public void setDbid(long dbid) {
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this.dbid = dbid;
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}
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}
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