chainedargumentmetadatasource.java

drools 一个开放源码的规则引擎

package org.drools.spring.metadata;

/*
 * Copyright 2005 (C) The Werken Company. All Rights Reserved.
 *
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided that the
 * following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright statements and
 * notices. Redistributions must also contain a copy of this document.
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 * from this Software without prior written permission of The Werken Company.
 * For written permission, please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "drools" nor may
 * "drools" appear in their names without prior written permission of The Werken
 * Company. "drools" is a registered trademark of The Werken Company.
 *
 * 5. Due credit should be given to The Werken Company.
 * (http://drools.werken.com/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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import java.lang.reflect.Method;

public class ChainedArgumentMetadataSource implements ArgumentMetadataSource {

    private final ArgumentMetadataSource[] delegates;

    public ChainedArgumentMetadataSource(ArgumentMetadataSource[] delegates) {
        if (delegates == null) {
            throw new IllegalArgumentException("delegates argument must not be null");
        }
        for (int i = 0; i < delegates.length; i++) {
            if (delegates[i] == null) {
                throw new IllegalArgumentException("delegates[" + i + "] element must not be null");
            }
        }
        this.delegates = delegates;
    }

    public ArgumentMetadata getArgumentMetadata(Method method, Class parameterType, int parameterIndex) {
        for (int i = 0; i < delegates.length; i++) {
            ArgumentMetadata metadata = delegates[i].getArgumentMetadata(method, parameterType, parameterIndex);
            if (metadata != null) {
                return metadata;
            }
        }
        return null;
    }
}