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MVEL is a powerful expression language for Java-based applications. It provides a plethora of features and is suited for everything from the smallest property binding and extraction, to full blown scripts.

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/**
 * 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.integration.impl;

import org.mvel2.UnresolveablePropertyException;
import org.mvel2.integration.VariableResolver;
import org.mvel2.integration.VariableResolverFactory;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class IndexedVariableResolverFactory extends BaseVariableResolverFactory {

  public IndexedVariableResolverFactory(String[] varNames, VariableResolver[] resolvers) {
    this.indexedVariableNames = varNames;
    this.indexedVariableResolvers = resolvers;
  }

  public IndexedVariableResolverFactory(String[] varNames, Object[] values) {
    this.indexedVariableNames = varNames;
    this.indexedVariableResolvers = createResolvers(values, varNames.length);
  }

  public IndexedVariableResolverFactory(String[] varNames, Object[] values, VariableResolverFactory nextFactory) {
    this.indexedVariableNames = varNames;
    this.nextFactory = new MapVariableResolverFactory();
    this.nextFactory.setNextFactory(nextFactory);
    this.indexedVariableResolvers = createResolvers(values, varNames.length);

  }

  private static VariableResolver[] createResolvers(Object[] values, int size) {
    VariableResolver[] vr = new VariableResolver[size];
    for (int i = 0; i < size; i++) {
      vr[i] = i >= values.length ? new SimpleValueResolver(null) : new IndexVariableResolver(i, values);
    }
    return vr;
  }

  public VariableResolver createIndexedVariable(int index, String name, Object value) {
    VariableResolver r = indexedVariableResolvers[index];
    r.setValue(value);
    return r;
  }

  public VariableResolver getIndexedVariableResolver(int index) {
    return indexedVariableResolvers[index];
  }

  public VariableResolver createVariable(String name, Object value) {
    VariableResolver vr = getResolver(name);
    if (vr != null) {
      vr.setValue(value);
    }
    return vr;
  }

  public VariableResolver createVariable(String name, Object value, Class type) {
    VariableResolver vr = getResolver(name);
    if (vr != null) {
      vr.setValue(value);
    }
    return vr;

//        if (nextFactory == null) nextFactory = new MapVariableResolverFactory(new HashMap());
//        return nextFactory.createVariable(name, value, type);
  }

  public VariableResolver getVariableResolver(String name) {
    VariableResolver vr = getResolver(name);
    if (vr != null) return vr;
    else if (nextFactory != null) {
      return nextFactory.getVariableResolver(name);
    }

    throw new UnresolveablePropertyException("unable to resolve variable '" + name + "'");
  }

  public boolean isResolveable(String name) {
    return isTarget(name) || (nextFactory != null && nextFactory.isResolveable(name));
  }

  protected VariableResolver addResolver(String name, VariableResolver vr) {
    variableResolvers.put(name, vr);
    return vr;
  }

  private VariableResolver getResolver(String name) {
    for (int i = 0; i < indexedVariableNames.length; i++) {
      if (indexedVariableNames[i].equals(name)) {
        return indexedVariableResolvers[i];
      }
    }
    return null;
  }

  public boolean isTarget(String name) {
    for (String indexedVariableName : indexedVariableNames) {
      if (indexedVariableName.equals(name)) {
        return true;
      }
    }
    return false;
  }

  public Set getKnownVariables() {
    return new HashSet(Arrays.asList(indexedVariableNames));
  }

  public void clear() {
    // variableResolvers.clear();

  }

  @Override
  public boolean isIndexedFactory() {
    return true;
  }
}