wrapper.java

大名鼎鼎的java动态脚本语言。已经通过了sun的认证

/*
 * Copyright 2006 John G. Wilson
 *
 * 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.codehaus.groovy.runtime.wrappers;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;

import org.codehaus.groovy.ast.ClassNode;

import groovy.lang.GroovyObject;
import groovy.lang.MetaClass;
import groovy.lang.MetaMethod;

/**
 * @author John Wilson
 *
 */

public abstract class Wrapper implements GroovyObject {
  protected MetaClass delegatingMetaClass = new MetaClass(Object.class) {
    /**
     * @param obj
     * @return
     * @see java.lang.Object#equals(java.lang.Object)
     */
    public boolean equals(Object obj) {
      return Wrapper.this.getDelegatedMetaClass().equals(obj);
    }

    /**
     * @param object
     * @param attribute
     * @return
     * @see groovy.lang.MetaClass#getAttribute(java.lang.Object, java.lang.String)
     */
    public Object getAttribute(Object object, String attribute) {
      return Wrapper.this.getDelegatedMetaClass().getAttribute(Wrapper.this.getWrapped(), attribute);
    }

    /**
     * @return
     * @see groovy.lang.MetaClass#getClassNode()
     */
    public ClassNode getClassNode() {
      return Wrapper.this.getDelegatedMetaClass().getClassNode();
    }

    /**
     * @return
     * @see groovy.lang.MetaClass#getMetaMethods()
     */
    public List getMetaMethods() {
      return Wrapper.this.getDelegatedMetaClass().getMetaMethods();
    }

    /**
     * @return
     * @see groovy.lang.MetaClass#getMethods()
     */
    public List getMethods() {
      return Wrapper.this.getDelegatedMetaClass().getMethods();
    }

    /**
     * @return
     * @see groovy.lang.MetaClass#getProperties()
     */
    public List getProperties() {
      return Wrapper.this.getDelegatedMetaClass().getProperties();
    }

    /**
     * @param object
     * @param property
     * @return
     * @see groovy.lang.MetaClass#getProperty(java.lang.Object, java.lang.String)
     */
    public Object getProperty(Object object, String property) {
      return Wrapper.this.getDelegatedMetaClass().getProperty(Wrapper.this.getWrapped(), property);
    }

    /**
     * @return
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
      return Wrapper.this.getDelegatedMetaClass().hashCode();
    }

    /**
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#invokeConstructor(java.lang.Object[])
     */
    public Object invokeConstructor(Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().invokeConstructor(arguments);
    }

    /**
     * @param at
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#invokeConstructorAt(java.lang.Class, java.lang.Object[])
     */
    public Object invokeConstructorAt(Class at, Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().invokeConstructorAt(at, arguments);
    }

    /**
     * @param object
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#invokeMethod(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public Object invokeMethod(Object object, String methodName, Object arguments) {
      return Wrapper.this.getDelegatedMetaClass().invokeMethod(Wrapper.this.getWrapped(), methodName, arguments);
    }

    /**
     * @param object
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#invokeMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public Object invokeMethod(Object object, String methodName, Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().invokeMethod(Wrapper.this.getWrapped(), methodName, arguments);
    }

    /**
     * @param object
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#invokeStaticMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public Object invokeStaticMethod(Object object, String methodName, Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().invokeStaticMethod(Wrapper.this.getWrapped(), methodName, arguments);
    }

    /**
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#retrieveConstructor(java.lang.Class[])
     */
    public Constructor retrieveConstructor(Class[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().retrieveConstructor(arguments);
    }

    /**
     * @param owner
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#retrieveMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public MetaMethod retrieveMethod(Object owner, String methodName, Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().retrieveMethod(owner, methodName, arguments);
    }

    /**
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#retrieveMethod(java.lang.String, java.lang.Class[])
     */
    public MetaMethod retrieveMethod(String methodName, Class[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().retrieveMethod(methodName, arguments);
    }

    /**
     * @param methodName
     * @param arguments
     * @return
     * @see groovy.lang.MetaClass#retrieveStaticMethod(java.lang.String, java.lang.Class[])
     */
    public MetaMethod retrieveStaticMethod(String methodName, Class[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().retrieveStaticMethod(methodName, arguments);
    }

    /**
     * @param object
     * @param attribute
     * @param newValue
     * @see groovy.lang.MetaClass#setAttribute(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public void setAttribute(Object object, String attribute, Object newValue) {
      Wrapper.this.getDelegatedMetaClass().setAttribute(Wrapper.this.getWrapped(), attribute, newValue);
    }

    /**
     * @param bean
     * @param map
     * @see groovy.lang.MetaClass#setProperties(java.lang.Object, java.util.Map)
     */
    public void setProperties(Object bean, Map map) {
      Wrapper.this.getDelegatedMetaClass().setProperties(Wrapper.this.getWrapped(), map);
    }

    /**
     * @param object
     * @param property
     * @param newValue
     * @see groovy.lang.MetaClass#setProperty(java.lang.Object, java.lang.String, java.lang.Object)
     */
    public void setProperty(Object object, String property, Object newValue) {
      Wrapper.this.getDelegatedMetaClass().setProperty(Wrapper.this.getWrapped(), property, newValue);
    }

    /**
     * @return
     * @see java.lang.Object#toString()
     */
    public String toString() {
      return Wrapper.this.getDelegatedMetaClass().toString();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#addNewInstanceMethod(java.lang.reflect.Method)
     */
    public void addNewInstanceMethod(Method method) {
      Wrapper.this.getDelegatedMetaClass().addNewInstanceMethod(method);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#addNewStaticMethod(java.lang.reflect.Method)
     */
    public void addNewStaticMethod(Method method) {
      Wrapper.this.getDelegatedMetaClass().addNewStaticMethod(method);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#checkInitialised()
     */
    public void checkInitialised() {
      Wrapper.this.getDelegatedMetaClass().checkInitialised();
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#pickMethod(java.lang.Object, java.lang.String, java.lang.Object[])
     */
    public MetaMethod pickMethod(Object object, String methodName, Object[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().pickMethod(object, methodName, arguments);
    }

    /* (non-Javadoc)
     * @see groovy.lang.MetaClass#pickMethod(java.lang.String, java.lang.Class[])
     */
    public MetaMethod pickMethod(String methodName, Class[] arguments) {
      return Wrapper.this.getDelegatedMetaClass().pickMethod(methodName, arguments);
    }
  };
  
  protected final Class constrainedType;
  
  public Wrapper(final Class constrainedType) {
    this.constrainedType = constrainedType;
  }

  /* (non-Javadoc)
   * @see groovy.lang.GroovyObject#getMetaClass()
   * 
   * This will only be useful post 1.0
   */
  public MetaClass getMetaClass() {
    return this.delegatingMetaClass;
  }
  
  public abstract Object unwrap();
  
  public Class getType() {
    return this.constrainedType;
  }
  
  protected abstract Object getWrapped();
  protected abstract MetaClass getDelegatedMetaClass();
}