/*
 * FindBugs - Find Bugs in Java programs
 * Copyright (C) 2006, University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs.classfile.impl;

import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;

import edu.umd.cs.findbugs.classfile.ClassDescriptor;
import edu.umd.cs.findbugs.classfile.DescriptorFactory;
import edu.umd.cs.findbugs.classfile.ICodeBaseEntry;

/**
 * Implementation of ICodeBaseEntry for resources in zipfile codebases.
 * 
 * @author David Hovemeyer
 */
public class ZipFileCodeBaseEntry extends AbstractScannableCodeBaseEntry {
	private final ZipFileCodeBase codeBase;
	private final ZipEntry zipEntry;

	public ZipFileCodeBaseEntry(ZipFileCodeBase codeBase, ZipEntry zipEntry) {
		this.codeBase = codeBase;
		this.zipEntry = zipEntry;
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBaseEntry#getNumBytes()
	 */
	public int getNumBytes() {
		return (int) zipEntry.getSize();
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBaseEntry#openResource()
	 */
	public InputStream openResource() throws IOException {
		return codeBase.zipFile.getInputStream(zipEntry);
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.impl.AbstractScannableCodeBaseEntry#getCodeBase()
	 */
	@Override
	public AbstractScannableCodeBase getCodeBase() {
		return codeBase;
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.impl.AbstractScannableCodeBaseEntry#getRealResourceName()
	 */
	@Override
	public String getRealResourceName() {
		return zipEntry.getName();
	}

	/* (non-Javadoc)
	 * @see edu.umd.cs.findbugs.classfile.ICodeBaseEntry#getClassDescriptor()
	 */
	public ClassDescriptor getClassDescriptor() {
		return DescriptorFactory.createClassDescriptorFromResourceName(getResourceName());
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#equals(java.lang.Object)
	 */
	@Override
	public boolean equals(Object obj) {
		if (obj == null || obj.getClass() != this.getClass()) {
			return false;
		}
		ZipFileCodeBaseEntry other = (ZipFileCodeBaseEntry) obj;
		return this.codeBase.equals(other.codeBase)
			&& this.zipEntry.equals(other.zipEntry);
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#hashCode()
	 */
	@Override
	public int hashCode() {
		return 7919 * codeBase.hashCode() + zipEntry.hashCode();
	}

	/* (non-Javadoc)
	 * @see java.lang.Object#toString()
	 */
	@Override
	public String toString() {
		return getCodeBase() + ":" + getResourceName();
	}
}
