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/*******************************************************************************
* Copyright (c) 2013, 2016 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.predicate;
import java.util.Arrays;
import org.eclipse.jpt.common.utility.internal.ClassTools;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.jpt.common.utility.predicate.Predicate;
/**
* This predicate evaluates to the (<code>boolean</code>) value one of the
* variable's methods.
* <p>
* <strong>NB:</strong> The actual method is determined at execution time,
* not construction time. As a result, the transformer can be used to emulate
* "duck typing".
*
* @param <V> the type of objects to be evaluated by the predicate
*/
public class MethodPredicate<V>
implements Predicate<V>
{
private final String methodName;
private final Class<?>[] parameterTypes;
private final Object[] arguments;
/**
* Construct a predicate that evaluates to the (<code>boolean</code>) value
* of the specified method.
*/
public MethodPredicate(String methodName, Class<?>[] parameterTypes, Object[] arguments) {
super();
if ((methodName == null) || (parameterTypes == null) || (arguments == null)) {
throw new NullPointerException();
}
this.methodName = methodName;
this.parameterTypes = parameterTypes;
this.arguments = arguments;
}
public boolean evaluate(V variable) {
return this.evaluate_(variable).booleanValue();
}
private Boolean evaluate_(V variable) {
return (Boolean) ObjectTools.execute(variable, this.methodName, this.parameterTypes, this.arguments);
}
public String getMethodName() {
return this.methodName;
}
public Class<?>[] getParameterTypes() {
return this.parameterTypes;
}
public Object[] getArguments() {
return this.arguments;
}
@Override
public boolean equals(Object o) {
if ( ! (o instanceof MethodPredicate<?>)) {
return false;
}
MethodPredicate<?> other = (MethodPredicate<?>) o;
return ObjectTools.equals(this.methodName, other.methodName) &&
Arrays.equals(this.parameterTypes, other.parameterTypes) &&
Arrays.equals(this.arguments, other.arguments);
}
@Override
public int hashCode() {
return this.methodName.hashCode() ^ Arrays.hashCode(this.parameterTypes) ^ Arrays.hashCode(this.arguments);
}
@Override
public String toString() {
return ObjectTools.toString(this, ClassTools.buildMethodSignature(this.methodName, this.parameterTypes));
}
}
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