groovy.lang.MetaProperty Maven / Gradle / Ivy

/*
 * 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
 *
 *     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 java.lang.reflect.Modifier;

import org.codehaus.groovy.runtime.MetaClassHelper;

/**
 * Represents a property on a bean which may have a getter and/or a setter
 * 
 * @author James Strachan
 * @version $Revision$
 */
public abstract class MetaProperty {

    protected final String name;
    protected Class type;
    public static final String PROPERTY_SET_PREFIX = "set";

    /**
     * Constructor that sets the property name and type (class)
     */
    public MetaProperty(String name, Class type) {
        this.name = name;
        this.type = type;
    }

    /**
     * @return the property of the given object
     * @throws Exception if the property could not be evaluated
     */
    public abstract Object getProperty(Object object);

    /**
     * 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 abstract void setProperty(Object object, Object newValue);

    /**
     * Return the name of the property
     *
     * @return the name of the property
     */
    public String getName() {
        return name;
    }

    /**
     * @return the type of the property
     */
    public Class getType() {
        return type;
    }
    
    /**
     * Returns the access modifier.
     * @return Modifier.PUBLIC
     */
    public int getModifiers() {
        return Modifier.PUBLIC;
    }

    /**
     * Gets the name for the getter for this property
     *
     * @return The name of the property. The name is "get"+ the capitalized propertyName
     *         or, in the case of boolean values, "is" + the capitalized propertyName
     */
    public static String getGetterName(String propertyName, Class type) {
        String prefix = type == boolean.class || type == Boolean.class ? "is" : "get";
        return prefix + MetaClassHelper.capitalize(propertyName);
    }

    /**
     * Gets the setter for the getter for this property.
     *
     * @return The name of the property. The name is "set"+ the capitalized propertyName.
     */
    public static String getSetterName(String propertyName) {
        return PROPERTY_SET_PREFIX + MetaClassHelper.capitalize(propertyName);
    }
}