YellOnFlushAndCloseOutputStream.java

package org.apache.commons.io.testtools;

import junit.framework.AssertionFailedError;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.commons.io.output.ProxyOutputStream;

/** 
 * Helper class for checking behaviour of IO classes.
 */
public class YellOnFlushAndCloseOutputStream extends ProxyOutputStream {
    private boolean yellForFlush;

    private boolean yellForClose;

    /** 
     * @param proxy OutputStream to delegate to.
     * @param yellForFlush True if flush() is forbidden
     * @param yellForClose True if close() is forbidden
     */
public YellOnFlushAndCloseOutputStream(OutputStream proxy ,boolean yellForFlush ,boolean yellForClose) {
        super(proxy);
        this.yellForFlush = yellForFlush;
        this.yellForClose = yellForClose;
    }

    /** 
     * @see java.io.OutputStream#flush()
     */
@Override
    public void flush() throws IOException {
        if (yellForFlush) {
            throw new AssertionFailedError("flush() was called on OutputStream");
        } 
        super.flush();
    }

    /** 
     * @see java.io.OutputStream#close()
     */
@Override
    public void close() throws IOException {
        if (yellForClose) {
            throw new AssertionFailedError("close() was called on OutputStream");
        } 
        super.close();
    }

    public void off() {
        yellForFlush = false;
        yellForClose = false;
    }
}