org.directwebremoting.extend.ConstructorProperty Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.
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/*
 * Copyright 2005 Joe Walker
 *
 * 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 org.directwebremoting.extend;

import java.lang.reflect.Constructor;
import java.lang.reflect.Type;

import org.directwebremoting.ConversionException;
import org.directwebremoting.util.LocalUtil;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ConstructorProperty implements Property
{
    /**
     * @param constructor
     * @param parameterName
     * @param parameterNumber
     */
    public ConstructorProperty(Constructor constructor, String parameterName, int parameterNumber)
    {
        this.constructor = constructor;
        this.parameterName = parameterName;
        this.parameterNumber = parameterNumber;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getName()
     */
    public String getName()
    {
        return parameterName;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getPropertyType()
     */
    public Class getPropertyType()
    {
        Type[] types = constructor.getGenericParameterTypes();
        if (parameterNumber >= types.length)
        {
            throw new IllegalArgumentException("parameterNumber=" + parameterNumber + " is too big when method=" + constructor.getName() + " returns genericParameterTypes.length=" + types.length);
        }

        Type parameterType = types[parameterNumber];
        return LocalUtil.toClass(parameterType, toString());
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#createChild(int)
     */
    public Property createChild(int nextNewParameterNumber)
    {
        Type[] types = constructor.getGenericParameterTypes();
        if (parameterNumber >= types.length)
        {
            throw new IllegalArgumentException("parameterNumber=" + parameterNumber + " is too big when method=" + constructor.getName() + " returns genericParameterTypes.length=" + types.length);
        }
        Type parameterType = types[parameterNumber];
        return new NestedProperty(this, constructor, parameterType, parameterNumber, nextNewParameterNumber);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#getValue(java.lang.Object)
     */
    public Object getValue(Object bean) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't get value from constructor parameter");
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.Property#setValue(java.lang.Object, java.lang.Object)
     */
    public void setValue(Object bean, Object value) throws ConversionException
    {
        throw new UnsupportedOperationException("Can't set value to constructor parameter");
    }

    /* (non-Javadoc)
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode()
    {
        return constructor.hashCode() + parameterNumber;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object obj)
    {
        if (obj == this)
        {
            return true;
        }

        if (obj == null || this.getClass() != obj.getClass())
        {
            return false;
        }

        ConstructorProperty that = (ConstructorProperty) obj;

        if (!this.constructor.equals(that.constructor))
        {
            return false;
        }

        return this.parameterNumber == that.parameterNumber;
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString()
    {
        return "ConstructorProperty[ctor=" + constructor.getName() + ",p#=" + parameterNumber + "]";
    }

    private final Constructor constructor;

    private final String parameterName;

    private final int parameterNumber;
}