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feilong is a suite of core and expanded libraries that include utility classes, http, excel,cvs, io classes, and much much more.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.feilong.lib.beanutils;

import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * 
 * An implementation of the {@code IntrospectionContext} interface used by
 * {@link PropertyUtilsBean} when doing introspection of a bean class.
 * 
 * 
 * This class implements the methods required by the
 * {@code IntrospectionContext} interface in a straight-forward manner
 * based on a map. It is used internally only. It is not thread-safe.
 * 
 *
 * @version $Id$
 * @since 1.9
 */
class DefaultIntrospectionContext implements IntrospectionContext{

    /** Constant for an empty array of property descriptors. */
    private static final PropertyDescriptor[]     EMPTY_DESCRIPTORS = new PropertyDescriptor[0];

    /** The current class for introspection. */
    private final Class                        currentClass;

    /** A map for storing the already added property descriptors. */
    private final Map descriptors;

    /**
     *
     * Creates a new instance of DefaultIntrospectionContext and sets
     * the current class for introspection.
     *
     * @param cls
     *            the current class
     */
    public DefaultIntrospectionContext(final Class cls){
        currentClass = cls;
        descriptors = new HashMap<>();
    }

    @Override
    public Class getTargetClass(){
        return currentClass;
    }

    @Override
    public void addPropertyDescriptor(final PropertyDescriptor desc){
        if (desc == null){
            throw new IllegalArgumentException("Property descriptor must not be null!");
        }
        descriptors.put(desc.getName(), desc);
    }

    @Override
    public void addPropertyDescriptors(final PropertyDescriptor[] descs){
        if (descs == null){
            throw new IllegalArgumentException("Array with descriptors must not be null!");
        }

        for (PropertyDescriptor desc : descs){
            addPropertyDescriptor(desc);
        }
    }

    @Override
    public boolean hasProperty(final String name){
        return descriptors.containsKey(name);
    }

    @Override
    public PropertyDescriptor getPropertyDescriptor(final String name){
        return descriptors.get(name);
    }

    @Override
    public void removePropertyDescriptor(final String name){
        descriptors.remove(name);
    }

    @Override
    public Set propertyNames(){
        return descriptors.keySet();
    }

    /**
     * Returns an array with all descriptors added to this context. This method
     * is used to obtain the results of introspection.
     *
     * @return an array with all known property descriptors
     */
    public PropertyDescriptor[] getPropertyDescriptors(){
        return descriptors.values().toArray(EMPTY_DESCRIPTORS);
    }
}