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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.mvel2.templates;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

public class SimpleTemplateRegistry implements TemplateRegistry {
  private Map NAMED_TEMPLATES = new HashMap();

  public void addNamedTemplate(String name, CompiledTemplate template) {
    NAMED_TEMPLATES.put(name, template);
  }

  public CompiledTemplate getNamedTemplate(String name) {
    CompiledTemplate t = NAMED_TEMPLATES.get(name);
    if (t == null) throw new TemplateError("no named template exists '" + name + "'");
    return t;
  }

  public Iterator iterator() {
    return NAMED_TEMPLATES.keySet().iterator();
  }

  public Set getNames() {
    return NAMED_TEMPLATES.keySet();
  }

  public boolean contains(String name) {
    return NAMED_TEMPLATES.containsKey(name);
  }
}