defaultentity.java

一个完整的XACML工程,学习XACML技术的好例子!

/*
 * Created on 12-Apr-2005
 *
 * TODO All
 */
package ke.defaultimpl.core;

import java.util.HashMap;
import java.util.Set;

import ke.core.CoreException;
import ke.core.Entity;
import ke.core.ConceptType;

/**
 * @author James Cunningham
 * The instance of a DefaultEntity may have properties
 * Each property could have multiple values
 * TODO All
 */
public class DefaultEntity extends Entity {

    /**
     * @param id
     * @param typeId
     * An instance of a DefaultEntity may have property and value pairs
     */
    public DefaultEntity(String id, 
            			 ConceptType type,
            			 HashMap propertyValues) {
        super(id, type);
        this.propertyValues = propertyValues;
    }

    /**
     * @param property
     * @return
     * @see ke.core.ConceptInstance#getPropertyValue(java.lang.String)
     */
    public Object getPropertyValue(String property) {
        if(!this.hasProperty(property))
            return null; //TODO is this correct behaviour?
        return this.propertyValues.get(property);
    }


    /**
     * @param property
     * @param value
     * @return
     * @see ke.core.ConceptInstance#setPropertyValue(java.lang.String, java.lang.Object)
     */
    
    public boolean setPropertyValue(String property, 
            						Object value) throws CoreException{
        if(!this.hasProperty(property))
            throw new CoreException("Error: invalid property name");
        Class valueClass = this.getType().getPropertyClass(property);
        if(!valueClass.isAssignableFrom(value.getClass()))
            throw new CoreException("Error: value has invalid class type");
        this.propertyValues.put(property, value);
        return false;
    }

    /**
     * @return
     * @see ke.core.ConceptInstance#getPropertyNames()
     */
    public String[] getPropertyNames() {
        Set names = this.propertyValues.keySet();
        return (String[])names.toArray(new String[names.size()]);
    }
    
    /**
     * @param propertyName
     * @return
     */
    
    private boolean hasProperty(String propertyName) {
        return this.propertyValues.keySet().contains(propertyName);
    }
    
    //------------------------------------

    private HashMap propertyValues;//which is set of property name and value pairs (String,String)
}