valuemapimpl.java

开发owl的API,提供了W3C规定标准接口,是目前比较少的API.

// The MIT License
//
// Copyright (c) 2004 Evren Sirin
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

/*
 * Created on Dec 28, 2003
 *
 */
package org.mindswap.owls.process.impl;

import java.util.Hashtable;
import java.util.Map;

import org.mindswap.owls.process.DataFlow;
import org.mindswap.owls.process.DataFlowElement;
import org.mindswap.owls.process.Parameter;
import org.mindswap.owls.process.ParameterList;
import org.mindswap.owls.process.ValueMap;
import org.mindswap.owls.process.ValueRewriter;

/**
 * @author Evren Sirin
 *
 */
public class ValueMapImpl extends Hashtable implements ValueMap {
	/**
	 * 
	 */
	public ValueMapImpl() {
		super();
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#setValue(org.mindswap.owls.process.Parameter)
	 */
	public void setValue(Parameter p, Object value) {
		if(p == null) throw new NullPointerException("ValueMap cannot set a value for null parameter");
		if(value == null) throw new NullPointerException("Value of parameter '" + p + "' cannot be set to null");
		
		put(p, value);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#getValue(org.mindswap.owls.process.Parameter)
	 */
	public Object getValue(Parameter p) {
		return get(p);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#hasValue(org.mindswap.owls.process.Parameter)
	 */
	public boolean hasValue(Parameter p) {
		return containsKey(p);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#clearValue(org.mindswap.owls.process.Parameter)
	 */
	public void clearValue(Parameter p) {
		remove(p);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#addMap(org.mindswap.owls.process.ValueMap)
	 */
	public void addMap(ValueMap valueMap) {
		putAll(valueMap);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#applyDataFlow(org.mindswap.owls.process.DataFlow)
	 */
	public void applyDataFlow(DataFlow dataFlow) {
		applyDataFlow(dataFlow, null);
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#applyDataFlow(org.mindswap.owls.process.DataFlow, org.mindswap.owls.process.ValueRewriter)
	 */
	public void applyDataFlow(DataFlow dataFlow, ValueRewriter rewriter) {
		Map.Entry[] entries = new Map.Entry[size()];
		entrySet().toArray(entries);
		
		for(int i = 0; i < entries.length; i++) {
			Map.Entry entry = entries[i];
			Parameter p = (Parameter) entry.getKey();
			Object value = entry.getValue();
			
			DataFlowElement dfe = dataFlow.getDFE(p);
			if(dfe == null) continue;
			for(int j = 0; j < dfe.size(); j++) {
				Parameter x = dfe.parameterAt(j);
				Object exists = getValue(x);
				
				if(exists != null) {
					if(!value.equals(exists))
						System.err.println("Warning: Two different values are assigned to " + p);				
				}
				else {
					if(rewriter != null)
						value = rewriter.rewrite(value.toString(), p.getType().getURI(), x.getType().getURI());
					
					setValue(x, value);
				}
			}
		}	
	}

	/* (non-Javadoc)
	 * @see org.mindswap.owls.process.ValueMap#retianValues(org.mindswap.owls.process.ParameterList)
	 */
	public void retainValues(ParameterList params) {
		Map.Entry[] entries = new Map.Entry[size()];
		entrySet().toArray(entries);
		
		for(int i = 0; i < entries.length; i++) {
			Map.Entry entry = entries[i];
			Parameter p = (Parameter) entry.getKey();
		
			if(!params.contains(p))
				clearValue(p);
		}
	}

}