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eXist-db NoSQL Database Core
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/*
 * eXist-db Open Source Native XML Database
 * Copyright (C) 2001 The eXist-db Authors
 *
 * [email protected]
 * http://www.exist-db.org
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.exist.util;

import java.io.InputStream;
import java.io.Reader;
import java.util.function.Supplier;

/**
 * @author Adam Retter
 */
public class InputStreamSupplierInputSource extends EXistInputSource {

    final Supplier inputStreamSupplier;

    public InputStreamSupplierInputSource(final Supplier inputStreamSupplier) {
        super();
        this.inputStreamSupplier = inputStreamSupplier;
    }

    @Override
    public Reader getCharacterStream() {
        assertOpen();
        return null;
    }

    /**
     * This method now does nothing, so collateral
     * effects from superclass with this one are avoided
     *
     * @throws IllegalStateException if the InputSource was previously closed
     */
    @Override
    public void setCharacterStream(final Reader r) {
        assertOpen();
        throw new IllegalStateException("InputStreamSupplierInputSource is immutable");
    }

    @Override
    public InputStream getByteStream() {
        assertOpen();
        return inputStreamSupplier.get();
    }

    /**
     * @see EXistInputSource#getByteStreamLength()
     *
     * @throws IllegalStateException if the InputSource was previously closed
     */
    @Override
    public long getByteStreamLength() {
        assertOpen();
        return -1;
    }

    /**
     * Set a byte stream input.
     *
     * @param is the input stream.
     *
     * @throws IllegalStateException this class is immutable!
     */
    @Override
    public void setByteStream(final InputStream is) {
        assertOpen();
        throw new IllegalStateException("InputStreamSupplierInputSource is immutable");
    }

    /**
     * This method now does nothing, so collateral
     * effects from superclass with this one are avoided
     *
     * @throws IllegalStateException if the InputSource was previously closed
     */
    @Override
    public void setSystemId(final String systemId) {
        assertOpen();
        // Nothing, so collateral effects are avoided!
    }

    /**
     * @see EXistInputSource#getSymbolicPath()
     *
     * @throws IllegalStateException if the InputSource was previously closed
     */
    @Override
    public String getSymbolicPath() {
        assertOpen();
        return null;
    }
}