GssResourceContentDescriber.java

/*******************************************************************************
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * 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.gwtplugins.gwt.eclipse.gss.clientbundle;

import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;

import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.QualifiedName;
import org.eclipse.core.runtime.content.IContentDescription;
import org.eclipse.core.runtime.content.ITextContentDescriber;
import org.eclipse.wst.css.core.internal.contenttype.ContentDescriberForCSS;

import com.google.gdt.eclipse.core.ContentDescriberUtilities;
import com.google.gwt.eclipse.core.nature.GWTNature;

/**
 * Describes <code>.css</code> files that can contain CssResource-specific extensions, such as @if.
 * <p>
 * This first delegates to the regular CSS content describer since if it cannot recognize the CSS file, neither can we
 * (CssResource extensions follow CSS syntax, so the regular CSS describer should not fail when it sees them.)
 */
@SuppressWarnings("restriction")
public class GssResourceContentDescriber implements ITextContentDescriber {

  private final ContentDescriberForCSS regularCssContentDescriber = new ContentDescriberForCSS();

  @Override
  public int describe(InputStream contents, IContentDescription description) throws IOException {

    // if (regularCssContentDescriber.describe(contents, description) == INVALID) {
    // return INVALID;
    // }

    return describe(ContentDescriberUtilities.resolveFileFromInputStream(contents));
  }

  @Override
  public int describe(Reader contents, IContentDescription description) throws IOException {

    // if (regularCssContentDescriber.describe(contents, description) == INVALID) {
    // return INVALID;
    // }

    return describe(ContentDescriberUtilities.resolveFileFromReader(contents));
  }

  @Override
  public QualifiedName[] getSupportedOptions() {
    QualifiedName[] qualifiedName = regularCssContentDescriber.getSupportedOptions();
    return qualifiedName;
  }

  private int describe(IFile file) {
    if (file == null) {
      return INDETERMINATE;
    }

    IProject project = file.getProject();
    if (project == null) {
      return INDETERMINATE;
    }

    boolean isGwtNature = GWTNature.isGWTProject(project);

    int value = file != null && isGwtNature ? VALID : INDETERMINATE;

    return value;
  }

}