001/**
002 * Copyright (C) 2006-2020 Talend Inc. - www.talend.com
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.talend.sdk.component.server.front.memory;
017
018import java.io.IOException;
019import java.io.InputStream;
020
021import javax.servlet.ReadListener;
022import javax.servlet.ServletInputStream;
023
024public class MemoryInputStream extends ServletInputStream {
025
026    protected final InputStream delegate;
027
028    protected boolean finished;
029
030    public MemoryInputStream(final InputStream delegate) {
031        this.delegate = delegate;
032    }
033
034    @Override
035    public boolean isFinished() {
036        return finished;
037    }
038
039    @Override
040    public boolean isReady() {
041        return true;
042    }
043
044    @Override
045    public void setReadListener(final ReadListener readListener) {
046        // no-op
047    }
048
049    @Override
050    public int read() throws IOException {
051        return delegate == null ? -1 : delegate.read();
052    }
053}