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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

cachedfield, cannot, cannot, field, groovyruntimeexception, groovyruntimeexception, illegalaccessexception, illegalaccessexception, metaproperty, object, object, reflection

The Groovy source code

 * Copyright 2003-2007 the original author or authors.
 * 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.codehaus.groovy.reflection;

import groovy.lang.GroovyRuntimeException;
import groovy.lang.MetaProperty;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public class CachedField extends MetaProperty {
    public final Field field;

    public CachedField(Field field) {
        super (field.getName(), field.getType());
        this.field = field;

    public boolean isStatic() {
        return Modifier.isStatic(getModifiers());

    public boolean isFinal() {
        return Modifier.isFinal(getModifiers());

    public int getModifiers() {
        return field.getModifiers();

     * @return the property of the given object
     * @throws RuntimeException if the property could not be evaluated
    public Object getProperty(final Object object) {
        try {
            return field.get(object);
        } catch (IllegalAccessException e) {
            throw new GroovyRuntimeException("Cannot get the property '" + name + "'.", e);

     * Sets the property on the given object to the new value
     * @param object on which to set the property
     * @param newValue the new value of the property
     * @throws RuntimeException if the property could not be set
    public void setProperty(final Object object, Object newValue) {
        final Object goalValue = DefaultTypeTransformation.castToType(newValue, field.getType());

        if (isFinal()) {
            throw new GroovyRuntimeException("Cannot set the property '" + name + "' because the backing field is final.");
        try {
            field.set(object, goalValue);
        } catch (IllegalAccessException ex) {
            throw new GroovyRuntimeException("Cannot set the property '" + name + "'.", ex);

Other Groovy examples (source code examples)

Here is a short list of links related to this Groovy source code file:

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