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Groovy example source code file (MetaBeanProperty.java)

This example Groovy source code file (MetaBeanProperty.java) is included in the DevDaily.com "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, class, groovyruntimeexception, metabeanproperty, metabeanproperty, metamethod, metamethod, metaproperty, object, object, reflection

The Groovy MetaBeanProperty.java source code

/*
 * Copyright 2003-2010 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
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.lang;

import org.codehaus.groovy.reflection.CachedField;
import org.codehaus.groovy.runtime.MetaClassHelper;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

import java.lang.reflect.Modifier;

/**
 * Represents a property on a bean which may have a getter and/or a setter
 *
 * @author <a href="mailto:james@coredevelopers.net">James Strachan
 * @author Pilho Kim
 * @version $Revision: 20587 $
 */
public class MetaBeanProperty extends MetaProperty {

    private MetaMethod getter;
    private MetaMethod setter;
    private CachedField field;

    public MetaBeanProperty(String name, Class type, MetaMethod getter, MetaMethod setter) {
        super(name, type);
        this.getter = getter;
        this.setter = setter;
    }

    /**
     * Get the property of the given object.
     *
     * @param object which to be got
     * @return the property of the given object
     * @throws RuntimeException if the property could not be evaluated
     */
    public Object getProperty(Object object) {
        MetaMethod getter = getGetter();
        if (getter == null) {
            if (field != null) return field.getProperty(object);
            //TODO: create a WriteOnlyException class?
            throw new GroovyRuntimeException("Cannot read write-only property: " + name);
        }
        return getter.invoke(object, MetaClassHelper.EMPTY_ARRAY);
    }

    /**
     * Set 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(Object object, Object newValue) {
        MetaMethod setter = getSetter();
        if (setter == null) {
            if (field != null && !Modifier.isFinal(field.getModifiers())) {
                field.setProperty(object, newValue);
                return;
            }
            throw new GroovyRuntimeException("Cannot set read-only property: " + name);
        }
        newValue = DefaultTypeTransformation.castToType(newValue, getType());
        setter.invoke(object, new Object[]{newValue});
    }

    /**
     * Get the getter method.
     */
    public MetaMethod getGetter() {
        return getter;
    }

    /**
     * Get the setter method.
     */
    public MetaMethod getSetter() {
        return setter;
    }

    /**
     * This is for MetaClass to patch up the object later when looking for get*() methods.
     */
    void setGetter(MetaMethod getter) {
        this.getter = getter;
    }

    /**
     * This is for MetaClass to patch up the object later when looking for set*() methods.
     */
    void setSetter(MetaMethod setter) {
        this.setter = setter;
    }

    public int getModifiers() {
        MetaMethod getter = getGetter();
        MetaMethod setter = getSetter();
        if (setter != null && getter == null) return setter.getModifiers();
        if (getter != null && setter == null) return getter.getModifiers();
        int modifiers = getter.getModifiers() | setter.getModifiers();
        int visibility = 0;
        if (Modifier.isPublic(modifiers)) visibility = Modifier.PUBLIC;
        if (Modifier.isProtected(modifiers)) visibility = Modifier.PROTECTED;
        if (Modifier.isPrivate(modifiers)) visibility = Modifier.PRIVATE;
        int states = getter.getModifiers() & setter.getModifiers();
        states &= ~(Modifier.PUBLIC | Modifier.PROTECTED | Modifier.PRIVATE);
        states |= visibility;
        return states;
    }

    public void setField(CachedField f) {
        this.field = f;
    }

    public CachedField getField() {
        return field;
    }
}

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