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ProGuardCORE is a free library to read, analyze, modify, and write Java class files.

There is a newer version: 9.1.6

/*
 * ProGuardCORE -- library to process Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * 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 proguard.resources.file.io;

import java.io.*;
import proguard.io.*;
import proguard.resources.file.*;
import proguard.resources.file.visitor.*;

/**
 * This {@link DataEntryReader} creates plain {@link ResourceFile} instances for the data entries
 * that it reads, and passes them to the given {@link ResourceFileVisitor}.
 *
 * @author Eric Lafortune
 */
public class ResourceFileDataEntryReader implements DataEntryReader {
  private final ResourceFileVisitor resourceFileVisitor;
  private final DataEntryFilter adaptedDataEntryFilter;

  /** Creates a new ResourceFileDataEntryReader */
  public ResourceFileDataEntryReader(ResourceFileVisitor resourceFileVisitor) {
    this(resourceFileVisitor, null);
  }

  /**
   * Creates a new ResourceFileDataEntryReader with the given filter that accepts data entries for
   * resource files that need to be adapted.
   */
  public ResourceFileDataEntryReader(
      ResourceFileVisitor resourceFileVisitor, DataEntryFilter adaptedDataEntryFilter) {
    this.resourceFileVisitor = resourceFileVisitor;
    this.adaptedDataEntryFilter = adaptedDataEntryFilter;
  }

  // Implementations for DataEntryReader.

  @Override
  public void read(DataEntry dataEntry) throws IOException {
    if (!dataEntry.isDirectory()) {
      ResourceFile resourceFile = new ResourceFile(dataEntry.getName(), dataEntry.getSize());

      // Collect references to Java tokens, if specified.
      if (adaptedDataEntryFilter != null && adaptedDataEntryFilter.accepts(dataEntry)) {
        ResourceJavaReferenceCollector resourceJavaReferenceCollector =
            new ResourceJavaReferenceCollector();
        resourceJavaReferenceCollector.read(dataEntry);
        resourceFile.references = resourceJavaReferenceCollector.getReferences();
      }

      // Pass the resource file to the visitor.
      resourceFileVisitor.visitResourceFile(resourceFile);
    }
  }
}