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/*******************************************************************************
* Copyright (c) 2016 Obeo.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.eef.core.api.utils;
import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.eef.common.api.utils.Util;
import org.eclipse.eef.core.api.controllers.IConsumer;
import org.eclipse.eef.core.internal.EEFCorePlugin;
import org.eclipse.eef.core.internal.Messages;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.sirius.common.interpreter.api.IEvaluationResult;
import org.eclipse.sirius.common.interpreter.api.IInterpreter;
import org.eclipse.sirius.common.interpreter.api.IVariableManager;
/**
* Utility class used to create the {@link Eval}.
*
* @author sbegaudeau
*/
public final class EvalFactory {
/**
* The constructor.
*/
private EvalFactory() {
// Prevent the instantiation
}
/**
* Creates a new {@link Eval} with the given interpreter and variables.
*
* @param interpreter
* The interpreter
* @param variables
* The variables
* @return The new {@link Eval} builder
*/
public static Eval<Object> of(IInterpreter interpreter, Map<String, Object> variables) {
return new Eval<Object>(interpreter, variables, Object.class);
}
/**
* Creates a new {@link Eval} with the given interpreter and variable manager.
*
* @param interpreter
* The interpreter
* @param variableManager
* The variable manager
* @return The new {@link Eval}
*/
public static Eval<Object> of(IInterpreter interpreter, IVariableManager variableManager) {
return new Eval<Object>(interpreter, variableManager, Object.class);
}
/**
* This class will be used to evaluate the expression.
*
* @author sbegaudeau
*
* @param <TYPE>
* The type of the result returned by the execution of the expression
*/
public static final class Eval<TYPE> {
/**
* The interpreter.
*/
private IInterpreter interpreter;
/**
* The variables.
*/
private Map<String, Object> variables = new HashMap<String, Object>();
/**
* The EAttribute containing the expression. It will be used, if not null, to log an error if the expression is
* blank.
*/
private EAttribute eAttribute;
/**
* The value to use by default if the evaluation of the expression returns null.
*/
private TYPE defaultValue;
/**
* The expected type of the result.
*/
private Class<TYPE> type;
/**
* The constructor.
*
* @param interpreter
* The interpreter
* @param variables
* The variables
* @param type
* The expected type of the result
*/
private Eval(IInterpreter interpreter, Map<String, Object> variables, Class<TYPE> type) {
this.interpreter = interpreter;
this.variables.putAll(variables);
this.type = type;
}
/**
* The constructor.
*
* @param interpreter
* The interpreter
* @param variableManager
* The variable manager
* @param type
* The expected type of the result
*/
private Eval(IInterpreter interpreter, IVariableManager variableManager, Class<TYPE> type) {
this(interpreter, variableManager.getVariables(), type);
}
/**
* Indicates that an error should be logged using the given EAttribute if the expression to execute is blank.
*
* @param attribute
* The EAttribute containing the expression to execute
* @return The current {@link Eval}
*/
public Eval<TYPE> logIfBlank(EAttribute attribute) {
this.eAttribute = attribute;
return this;
}
/**
* Indicates that the result should have the same type as the given class. It will log an error if the type of
* the result does not match the given type.
*
* @param expectedType
* The expected type
* @param <E>
* The expected type of the execution of the expression
* @return The current {@link Eval}
*
*/
public <E> Eval<E> logIfInvalidType(Class<E> expectedType) {
E value = null;
if (expectedType.isInstance(this.defaultValue)) {
value = expectedType.cast(this.defaultValue);
}
return new Eval<E>(this.interpreter, this.variables, expectedType).logIfBlank(this.eAttribute).defaultValue(value);
}
/**
* Indicates the value to use by default if the result of the evaluation of the expression is null.
*
* @param value
* The default value
* @return The current {@link Eval}
*/
public Eval<TYPE> defaultValue(TYPE value) {
this.defaultValue = value;
return this;
}
/**
* Executes the given expression and process its result using the given consumer.
*
* @param expression
* The expression
*/
public void call(String expression) {
this.call(expression, null);
}
/**
* Executes the given expression and process its result using the given consumer.
*
* @param expression
* The expression
* @param consumer
* The consumer
*/
public void call(String expression, IConsumer<TYPE> consumer) {
if (Util.isBlank(expression)) {
if (this.eAttribute != null && EEFCorePlugin.getPlugin() != null) {
EEFCorePlugin.getPlugin().blank(this.eAttribute);
}
if (this.defaultValue != null) {
consumer.apply(this.defaultValue);
}
return;
}
IEvaluationResult evaluationResult = this.interpreter.evaluateExpression(this.variables, expression);
if (evaluationResult.success()) {
if (consumer != null) {
TYPE returnValue = this.defaultValue;
Object value = evaluationResult.getValue();
if (value != null && this.type.isInstance(value)) {
returnValue = this.type.cast(value);
} else if (value != null && EEFCorePlugin.getPlugin() != null) {
String message = MessageFormat.format(Messages.AbstractEEFWidgetController_InvalidValueForExpression, expression,
this.type.getName(), value);
EEFCorePlugin.getPlugin().error(message);
}
consumer.apply(returnValue);
}
} else if (EEFCorePlugin.getPlugin() != null) {
EEFCorePlugin.getPlugin().diagnostic(expression, evaluationResult.getDiagnostic());
}
}
/**
* Executes the given expression.
*
* @param expression
* The expression
* @return The result of the expression
*/
public TYPE evaluate(String expression) {
if (Util.isBlank(expression)) {
if (this.eAttribute != null && EEFCorePlugin.getPlugin() != null) {
EEFCorePlugin.getPlugin().blank(this.eAttribute);
}
return this.defaultValue;
}
TYPE result = this.defaultValue;
IEvaluationResult evaluationResult = this.interpreter.evaluateExpression(this.variables, expression);
if (evaluationResult.success()) {
Object value = evaluationResult.getValue();
if (value != null && this.type.isInstance(value)) {
TYPE castValue = this.type.cast(value);
result = castValue;
} else if (value != null && EEFCorePlugin.getPlugin() != null) {
String message = MessageFormat.format(Messages.AbstractEEFWidgetController_InvalidValueForExpression, expression,
this.type.getName(), value);
EEFCorePlugin.getPlugin().error(message);
}
} else if (EEFCorePlugin.getPlugin() != null) {
EEFCorePlugin.getPlugin().diagnostic(expression, evaluationResult.getDiagnostic());
}
return result;
}
}
}
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