DelegatingMethodDefinitionSource.java :  » J2EE » spring-ide_2.3.0 » org » springframework » security » intercept » method » Java Open Source

package org.springframework.security.intercept.method;

import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import org.springframework.beans.factory.InitializingBean;
import org.springframework.security.ConfigAttributeDefinition;
import org.springframework.util.Assert;

/**
 * Automatically tries a series of method definition sources, relying on the first source of metadata
 * that provides a non-null response.
 * 
 * @author Ben Alex
 * @version $Id$
 */
public final class DelegatingMethodDefinitionSource implements MethodDefinitionSource, InitializingBean {
  private List methodDefinitionSources;
  
  public void afterPropertiesSet() throws Exception {
    Assert.notEmpty(methodDefinitionSources, "A list of MethodDefinitionSources is required");
  }

  public ConfigAttributeDefinition getAttributes(Method method, Class targetClass) {
    Iterator i = methodDefinitionSources.iterator();
    while (i.hasNext()) {
      MethodDefinitionSource s = (MethodDefinitionSource) i.next();
      ConfigAttributeDefinition result = s.getAttributes(method, targetClass);
      if (result != null) {
        return result;
      }
    }
    return null;
  }

  public ConfigAttributeDefinition getAttributes(Object object) throws IllegalArgumentException {
    Iterator i = methodDefinitionSources.iterator();
    while (i.hasNext()) {
      MethodDefinitionSource s = (MethodDefinitionSource) i.next();
      ConfigAttributeDefinition result = s.getAttributes(object);
      if (result != null) {
        return result;
      }
    }
    return null;
  }

  public Collection getConfigAttributeDefinitions() {
    Set set = new HashSet();
    Iterator i = methodDefinitionSources.iterator();
    while (i.hasNext()) {
      MethodDefinitionSource s = (MethodDefinitionSource) i.next();
      Collection attrs = s.getConfigAttributeDefinitions();
      if (attrs != null) {
        set.addAll(attrs);
      }
    }
    return set;
  }

  public boolean supports(Class clazz) {
    Iterator i = methodDefinitionSources.iterator();
    while (i.hasNext()) {
      MethodDefinitionSource s = (MethodDefinitionSource) i.next();
      if (s.supports(clazz)) {
        return true;
      }
    }
    return false;
  }

  public void setMethodDefinitionSources(List methodDefinitionSources) {
    Assert.notEmpty(methodDefinitionSources, "A list of MethodDefinitionSources is required");
    this.methodDefinitionSources = methodDefinitionSources;
  }
}