juneau-utest-utils/src/main/java/org/apache/juneau/testutils/MockStreamParser.java

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// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
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package org.apache.juneau.testutils;

import java.io.*;

import org.apache.juneau.*;
import org.apache.juneau.common.internal.*;
import org.apache.juneau.parser.*;

/**
 * Utility class for creating mocked stream parser.
 */
public class MockStreamParser extends InputStreamParser {

	//-------------------------------------------------------------------------------------------------------------------
	// Static
	//-------------------------------------------------------------------------------------------------------------------

	public static Builder create() {
		return new Builder();
	}

	//-------------------------------------------------------------------------------------------------------------------
	// Builder
	//-------------------------------------------------------------------------------------------------------------------

	public static class Builder extends InputStreamParser.Builder {
		MockStreamParserFunction function;

		public Builder function(MockStreamParserFunction value) {
			function = value;
			return this;
		}

		@Override
		public Builder consumes(String value) {
			super.consumes(value);
			return this;
		}

		@Override
		public Builder copy() {
			return this;
		}
	}

	//-------------------------------------------------------------------------------------------------------------------
	// Instance
	//-------------------------------------------------------------------------------------------------------------------

	private final MockStreamParserFunction function;

	public MockStreamParser(Builder builder) {
		super(builder);
		this.function = builder.function;
	}

	@Override
	@SuppressWarnings("unchecked")
	public <T> T doParse(ParserSession session, ParserPipe pipe, ClassMeta<T> type) throws IOException, ParseException, ExecutableException {
		if (function != null)
			return (T)function.apply((InputStreamParserSession)session, IOUtils.readBytes(pipe.getInputStream()), type);
		return null;
	}
}