net.sf.expectit.ExpectBuilder Maven / Gradle / Ivy
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package net.sf.expectit;
/*
* #%L
* ExpectIt
* %%
* Copyright (C) 2014 Alexey Gavrilov and contributors
* %%
* Licensed 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.
* #L%
*/
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.channels.Pipe;
import java.nio.charset.Charset;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;
import net.sf.expectit.echo.EchoOutput;
import net.sf.expectit.filter.Filter;
import net.sf.expectit.filter.Filters;
/**
* A class used to construct {@link Expect} instances.
*/
public class ExpectBuilder {
/**
* The default timeout value of 30000 milliseconds.
*/
public static final int DEFAULT_TIMEOUT_MS = 30000;
/**
* The default buffer size in bytes.
*/
public static final int DEFAULT_BUFFER_SIZE = 1024;
private InputStream[] inputs;
private Filter filter;
private OutputStream output;
private long timeout = DEFAULT_TIMEOUT_MS;
private EchoOutput echoOutputOld;
private Charset charset = Charset.defaultCharset();
@Deprecated
private boolean errorOnTimeout;
private String lineSeparator = "\n";
private Appendable echoOutput;
private Appendable echoInput;
private Appendable[] echoInputs;
private int bufferSize = DEFAULT_BUFFER_SIZE;
private boolean exceptionOnFailure;
private boolean autoFlushEcho;
private boolean combineInputs;
private ExecutorService executor;
/**
* Default constructor.
*/
public ExpectBuilder() {
}
/**
* Sets the output stream where {@link Expect} sends command to. Optional,
* if not set then all the
* send method are expected to throw {@link NullPointerException}.
*
* @param output the output stream
* @return this
*/
public final ExpectBuilder withOutput(OutputStream output) {
this.output = output;
return this;
}
/**
* Sets the input streams for expect operations. Required.
*
* @param inputs the input stream
* @return this
*/
public final ExpectBuilder withInputs(InputStream... inputs) {
this.inputs = inputs;
return this;
}
/**
* Sets the default timeout in the given unit for expect operations. Optional,
* the default value is 30 seconds.
*
* @param duration the timeout value
* @param unit the time unit
* @return this
* @throws java.lang.IllegalArgumentException if the timeout {@code <= 0}
*/
public final ExpectBuilder withTimeout(long duration, TimeUnit unit) {
validateDuration(duration);
this.timeout = unit.toMillis(duration);
return this;
}
static void validateDuration(long duration) {
if (duration <= 0) {
throw new IllegalArgumentException("Duration <= 0");
}
}
/**
* Sets the default timeout to infinity.
*
* @return this
*/
public final ExpectBuilder withInfiniteTimeout() {
this.timeout = -1;
return this;
}
/**
* Sets the echo output to print all the sent and received data. Useful for debugging to
* monitor I/O activity.
* Optional, by default is unset.
*
* @param echoOutput an instance of echo output. Refer to {@link net.sf.expectit.echo
* .EchoAdapters} for adapter
* static methods for common use cases.
* @return this
*/
@Deprecated
public final ExpectBuilder withEchoOutput(EchoOutput echoOutput) {
this.echoOutputOld = echoOutput;
return this;
}
/**
* Enables printing of all the sent data. Useful for debugging to monitor I/O activity.
* Optional, by default is unset.
*
* @param echoOutput where to echo the sent data.
* @return this
*/
public final ExpectBuilder withEchoOutput(Appendable echoOutput) {
this.echoOutput = echoOutput;
return this;
}
/**
* Enables printing of all the received data. Useful for debugging to monitor I/O activity.
* Optional, by default is unset.
*
* If the only {@code firstInput} is specified then the data received from all the inputs is
* echoed to it.
*
* The build method throws an {@link java.lang.IllegalArgumentException} if the number of the
* {@code otherInputs}
* parameters does not correspond to the number of the input streams. That is,
* if {@code otherInputs}
* is specified, the number of them must be equal to the number of inputs minus 1.
*
* The byte data received from the input streams is converted to strings using the
* builder's charset. See {@link ExpectBuilder#withCharset(java.nio.charset.Charset)} for
* more information.
*
* @param firstInput where to echo the received data for the first input. If {@code
* otherInputs} are empty, then
* all the data will be echoed to it.
* @param otherInputs where to echo the received data for other inputs.
* @return this
*/
public final ExpectBuilder withEchoInput(Appendable firstInput, Appendable... otherInputs) {
this.echoInput = firstInput;
this.echoInputs = otherInputs;
return this;
}
/**
* Sets the character encoding used to covert bytes when working with byte streams. Optional,
* the default is
* {@link Charset#defaultCharset}.
*
* @param charset the charset
* @return this
*/
public final ExpectBuilder withCharset(Charset charset) {
this.charset = charset;
return this;
}
/**
* Sets a filter for the input. Optional, by default no filter is applied.
*
* Filters can be used to modify the input before performing expect operations. For example,
* to remove
* non-printable characters. Filters can be switched on and off while working with the expect
* instance.
*
* @param filter the filter
* @param moreFilters more filter to apply. if specified then all the filters are combined
* using the
* {@link Filters#chain(Filter...)} method.s
* @return this
*/
public final ExpectBuilder withInputFilters(Filter filter, Filter... moreFilters) {
if (moreFilters.length == 0) {
this.filter = filter;
} else {
Filter[] filters = new Filter[moreFilters.length + 1];
filters[0] = filter;
System.arraycopy(moreFilters, 0, filters, 1, moreFilters.length);
this.filter = Filters.chain(filters);
}
return this;
}
/**
* Enables throwing an {@link java.lang.AssertionError} if any expect operation times out.
* Optional, disabled by default.
*
* @param errorOnTimeout the error flag
* @return this
* @deprecated This method is deprecated and will be removed. Use
* {@link #withExceptionOnFailure()} instead.
*/
@Deprecated
public final ExpectBuilder withErrorOnTimeout(boolean errorOnTimeout) {
this.errorOnTimeout = errorOnTimeout;
return this;
}
/**
* Enables throwing an {@link ExpectIOException} if an expect operation
* was not successful. Optional, disabled by default.
*
* @return this
*/
public final ExpectBuilder withExceptionOnFailure() {
this.exceptionOnFailure = true;
return this;
}
/**
* Sets the line separator used by the {@link Expect#sendLine()} method. Optional, default
* is '\n'.
*
* The default line separator was intentionally made non-system specific to avoid issues like
* when the tool is running on Windows and sending {@code CRLF} to a Unix system which threats
* them as two new lines.
*
*
* @param lineSeparator the line separator
* @return this
*/
public final ExpectBuilder withLineSeparator(String lineSeparator) {
this.lineSeparator = lineSeparator;
return this;
}
/**
* Sets the size of the input buffer in bytes. Optional, default is 1024.
*
* @param bufferSize the buffer size
* @return this
* @throws java.lang.IllegalArgumentException if {@code bufferSize} is <= 0
*/
public final ExpectBuilder withBufferSize(int bufferSize) {
if (bufferSize <= 0) {
throw new IllegalArgumentException("bufferSize must be > 0");
}
this.bufferSize = bufferSize;
return this;
}
/**
* Enables automatic flushing of the echo input and output after each match operation
* if the given echo object(s) implements {@link java.io.Flushable} interface.
*
* @param autoFlushEcho the auto flushing flag.
* @return this
*/
public final ExpectBuilder withAutoFlushEcho(boolean autoFlushEcho) {
this.autoFlushEcho = autoFlushEcho;
return this;
}
/**
* Combines input streaming data into one input. Data from all the inputs can be expected in
* the first input. Useful if you want to perform match operation on data that is coming from
* two input streams.
*
* @param combineInputs the combine inputs flag.
* @return this.
*/
public final ExpectBuilder withCombineInputs(boolean combineInputs) {
this.combineInputs = combineInputs;
return this;
}
/**
* Set the executor used to create internal thread. If not specified, an executor with the
* number of threads corresponding to the number of inputs will be created internally.
* IMPORTANT! Make sure that the given executor has the number of threads greater or
* equal than the number of input streams.
* If the executor is passed form outside it won't be shutdown when the Expect instance is
* closed.
*
* @param executor the executor service to use.
* @return this.
*/
public final ExpectBuilder withExecutor(ExecutorService executor) {
this.executor = executor;
return this;
}
/**
* Creates a ready to use {@link Expect} instance.
*
* This method creates an instance and starts background threads that receive input data
* through NIO pipes. The
* created instance must be disposed after use by calling the {@link net.sf.expectit
* .Expect#close()} method,
*
* The instance is not thread safe and intended to be used in a single thread.
*
* @return the instance
* @throws java.io.IOException if I/O error occurs
* @throws java.lang.IllegalStateException if the {@code inputs} are incorrect
*/
public final Expect build() throws IOException {
if (inputs == null || inputs.length == 0) {
throw new IllegalStateException("Inputs are null or empty");
}
if (echoInputs != null && echoInputs.length != 0
&& echoInputs.length != inputs.length - 1) {
throw new IllegalArgumentException(
"The number of echo input does not correspond to the total "
+ "number of the input streams");
}
SingleInputExpect[] inputs = new SingleInputExpect[this.inputs.length];
Pipe pipe = null;
Pipe.SourceChannel source = null;
Pipe.SinkChannel sink = null;
for (int i = 0; i < inputs.length; i++) {
if (!combineInputs || pipe == null) {
pipe = Pipe.open();
source = pipe.source();
sink = pipe.sink();
}
inputs[i] = new SingleInputExpect(
source,
sink,
this.inputs[i],
charset,
getEchoInputForIndex(i),
filter,
bufferSize,
autoFlushEcho);
}
if (echoOutputOld != null) {
echoOutput = new AppendableAdapter() {
@Override
public Appendable append(CharSequence csq) throws IOException {
echoOutputOld.onSend(csq.toString());
return this;
}
};
}
ExpectImpl instance = new ExpectImpl(
timeout,
output,
inputs,
charset,
echoOutput,
errorOnTimeout,
lineSeparator,
exceptionOnFailure,
autoFlushEcho,
executor);
instance.start();
return instance;
}
private Appendable getEchoInputForIndex(final int i) {
if (echoOutputOld != null) {
return new AppendableAdapter() {
@Override
public Appendable append(CharSequence csq) throws IOException {
echoOutputOld.onReceive(i, csq.toString());
return this;
}
};
}
if (echoInput == null) {
return null;
} else if (echoInputs.length == 0 || i == 0) {
return echoInput;
} else {
return echoInputs[i - 1];
}
}
}
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