/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.jackrabbit.vault.fs.io;

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

import org.apache.jackrabbit.vault.fs.api.VaultInputSource;
import org.apache.jackrabbit.vault.fs.config.DefaultMetaInf;
import org.apache.jackrabbit.vault.fs.config.MetaInf;

/**
 * Implements an archive that is based on a sub-tree of another archive
 */
public class SubArchive extends AbstractArchive {

    private Archive base;

    private Entry root;

    private final boolean isJcrRoot;

    private DefaultMetaInf inf = new DefaultMetaInf();

    public SubArchive(Archive base, Entry root, boolean isJcrRoot) {
        this.base = base;
        this.root = root;
        this.isJcrRoot = isJcrRoot;
        inf.setSettings(base.getMetaInf().getSettings());
        inf.setConfig(base.getMetaInf().getConfig());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Entry getRoot() throws IOException {
        return root;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Entry getJcrRoot() throws IOException {
        if (isJcrRoot) {
            return root;
        } else {
            return super.getJcrRoot();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void open(boolean strict) throws IOException {
        // assume open
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public MetaInf getMetaInf() {
        return inf;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void close() {
        base = null;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public InputStream openInputStream(Entry entry) throws IOException {
        return base.openInputStream(entry);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public VaultInputSource getInputSource(Entry entry) throws IOException {
        return base.getInputSource(entry);
    }
}
