/*
 * Copyright 2007 The authors
 * 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 com.intellij.struts2.dom.struts.strutspackage;

import com.intellij.openapi.util.Comparing;
import com.intellij.openapi.util.Condition;
import com.intellij.util.containers.ContainerUtil;
import com.intellij.util.xml.ConvertContext;
import com.intellij.util.xml.DomElement;
import com.intellij.util.xml.ResolvingConverter;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.Collections;

/**
 * Global <code>exception-mapping</code> "result".
 *
 * @author Yann Cébron
 */
public class GlobalExceptionMappingResultResolveConverter extends ResolvingConverter<GlobalResult> {

  @NotNull
  public Collection<? extends GlobalResult> getVariants(final ConvertContext context) {
    final DomElement invocationElement = context.getInvocationElement();
    final StrutsPackage strutsPackage = invocationElement.getParentOfType(StrutsPackage.class, true);
    if (strutsPackage != null) {
      return strutsPackage.getGlobalResults().getResults();
    }

    return Collections.emptySet();
  }

  public GlobalResult fromString(@Nullable @NonNls final String value, final ConvertContext context) {
    if (value == null) {
      return null;
    }

    return ContainerUtil.find(getVariants(context), new Condition<GlobalResult>() {
      public boolean value(final GlobalResult globalResult) {
        return Comparing.equal(value, globalResult.getName().getStringValue());
      }
    });
  }

  public String toString(@Nullable final GlobalResult result, final ConvertContext context) {
    if (result == null) {
      return null;
    }

    return result.getName().getStringValue();
  }

  public String getErrorMessage(@Nullable final String value, final ConvertContext context) {
    return "Cannot resolve global result ''" + value + "''";
  }

}