/*******************************************************************************
 *******************************************************************************/
package at.gv.egiz.eaaf.core.impl.idp.process;

import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import at.gv.egiz.eaaf.core.api.idp.process.ExecutionContext;

/**
 * ExecutionContext implementation, related to a certain process instance.
 * 
 * @author tknall
 * 
 */
public class ExecutionContextImpl implements ExecutionContext {

	private static final long serialVersionUID = 1L;

	private Map<String, Serializable> ctxData = Collections.synchronizedMap(new HashMap<String, Serializable>());

	private String processInstanceId;

	/**
	 * Creates a new instance.
	 */
	public ExecutionContextImpl() {
	}

	/**
	 * Creates a new instance and associated it with a certain process instance.
	 */
	public ExecutionContextImpl(String processInstanceId) {
		this.processInstanceId = processInstanceId;
	}

	@Override
	public void setProcessInstanceId(String processInstanceId) {
		this.processInstanceId = processInstanceId;
	}

	@Override
	public String getProcessInstanceId() {
		return processInstanceId;
	}

	@Override
	public Serializable get(String key) {
		return ctxData.get(key);
	}

	@Override
	public Serializable remove(String key) {
		return ctxData.remove(key);
	}

	@Override
	public void put(String key, Serializable object) {
		ctxData.put(key, object);
	}

	@Override
	public Set<String> keySet() {
		return Collections.unmodifiableSet(ctxData.keySet());
	}

	@Override
	public String toString() {
		StringBuilder builder = new StringBuilder();
		builder.append("ExecutionContextImpl [");
		builder.append("id=").append(processInstanceId);
		builder.append(", variables=");
		builder.append(ctxData.keySet());
		builder.append("]");
		return builder.toString();
	}

}