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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.svl;

import static org.apache.juneau.internal.StringUtils.*;
import static org.apache.juneau.internal.ThrowableUtils.*;

import java.util.*;

/**
 * A subclass of {@link DefaultingVar} that simply pulls values from a {@link Map}.
 *
 * <ul class='seealso'>
 * 	<li class='link'>{@doc juneau-marshall.SimpleVariableLanguage.SvlVariables}
 * </ul>
 */
@SuppressWarnings("rawtypes")
public abstract class MapVar extends DefaultingVar {

	private final Map m;

	/**
	 * Constructor.
	 *
	 * @param name The name of this variable.
	 * @param m The map to pull values from.
	 */
	public MapVar(String name, Map m) {
		super(name);
		if (m == null)
			illegalArg("''m'' parameter cannot be null.");
		this.m = m;
	}

	@Override /* Var */
	public String resolve(VarResolverSession session, String varVal) {
		return stringify(m.get(varVal));
	}
}
