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MethodReference.java
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MethodReference.java
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/*
* Copyright (c) 2021 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.el;
import java.lang.annotation.Annotation;
import java.util.Arrays;
/**
* Provides information about the method to which a method expression resolves.
*
* Two MethodReference instances are considered equal if the reference the same
* method on the same base object.
*/
public class MethodReference {
private final Object base;
private final MethodInfo methodInfo;
private final Annotation[] annotations;
private final Object[] evaluatedParameters;
public MethodReference(Object base, MethodInfo methodInfo, Annotation[] annotations, Object[] evaluatedParameters) {
this.base = base;
this.methodInfo = methodInfo;
this.annotations = annotations;
this.evaluatedParameters = evaluatedParameters;
}
/**
* Obtain the base object on which the method will be invoked.
*
* @return The base object on which the method will be invoked or
* {@code null} for literal method expressions.
*/
public Object getBase() {
return base;
}
/**
* Obtain the {@link MethodInfo} for the {@link MethodExpression} for which
* this {@link MethodReference} has been generated.
*
* @return The {@link MethodInfo} for the {@link MethodExpression} for which
* this {@link MethodReference} has been generated.
*/
public MethodInfo getMethodInfo() {
return this.methodInfo;
}
/**
* Obtain the annotations on the method to which the associated expression
* resolves.
*
* @return The annotations on the method to which the associated expression
* resolves. If the are no annotations, then an empty array is
* returned.
*/
public Annotation[] getAnnotations() {
return annotations;
}
/**
* Obtain the evaluated parameter values that will be passed to the method
* to which the associated expression resolves.
*
* @return The evaluated parameters.
*/
public Object[] getEvaluatedParameters() {
return evaluatedParameters;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + Arrays.hashCode(annotations);
result = prime * result + ((base == null) ? 0 : base.hashCode());
result = prime * result + Arrays.deepHashCode(evaluatedParameters);
result = prime * result + ((methodInfo == null) ? 0 : methodInfo.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
MethodReference other = (MethodReference) obj;
if (!Arrays.equals(annotations, other.annotations)) {
return false;
}
if (base == null) {
if (other.base != null) {
return false;
}
} else if (!base.equals(other.base)) {
return false;
}
if (!Arrays.deepEquals(evaluatedParameters, other.evaluatedParameters)) {
return false;
}
if (methodInfo == null) {
if (other.methodInfo != null) {
return false;
}
} else if (!methodInfo.equals(other.methodInfo)) {
return false;
}
return true;
}
}