/*
* Copyright 2014 the original author or authors.
*
* 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.
*/
package org.grails.encoder;
import org.grails.charsequences.CharSequences;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
public class EncodesToWriterAdapter implements EncodesToWriter {
private final StreamingEncoder encoder;
private boolean ignoreEncodingState;
public EncodesToWriterAdapter(StreamingEncoder encoder) {
this(encoder, false);
}
public EncodesToWriterAdapter(StreamingEncoder encoder, boolean ignoreEncodingState) {
this.encoder = encoder;
this.ignoreEncodingState = ignoreEncodingState;
}
@Override
public void encodeToWriter(CharSequence str, int off, int len, Writer writer, EncodingState encodingState) throws IOException {
if(shouldEncodeWith(encoder, encodingState)) {
encoder.encodeToStream(encoder, str, off, len, new WriterEncodedAppender(writer), createNewEncodingState(encoder, encodingState));
} else {
CharSequences.writeCharSequence(writer, str, off, len);
}
}
@Override
public void encodeToWriter(char[] buf, int off, int len, Writer writer, EncodingState encodingState) throws IOException {
if(shouldEncodeWith(encoder, encodingState)) {
encoder.encodeToStream(encoder, CharSequences.createCharSequence(buf, off, len), 0, len, new WriterEncodedAppender(writer), createNewEncodingState(encoder, encodingState));
} else {
writer.write(buf, off, len);
}
}
protected EncodingState createNewEncodingState(Encoder encoder, EncodingState encodingState) {
if (encodingState == null) {
return new EncodingStateImpl(encoder, null);
}
return encodingState.appendEncoder(encoder);
}
protected boolean shouldEncodeWith(Encoder encoderToApply, EncodingState encodingState) {
return ignoreEncodingState || encodingState == null || DefaultEncodingStateRegistry.shouldEncodeWith(encoderToApply,
encodingState);
}
public StreamingEncoder getStreamingEncoder() {
return encoder;
}
public boolean isIgnoreEncodingState() {
return ignoreEncodingState;
}
public void setIgnoreEncodingState(boolean ignoreEncodingState) {
this.ignoreEncodingState = ignoreEncodingState;
}
@Override
public EncodesToWriter createChainingEncodesToWriter(List<StreamingEncoder> additionalEncoders, boolean applyAdditionalFirst) {
EncodesToWriterAdapter chained = createChainingEncodesToWriter(getStreamingEncoder(), additionalEncoders, applyAdditionalFirst);
chained.setIgnoreEncodingState(isIgnoreEncodingState());
return chained;
}
public static EncodesToWriterAdapter createChainingEncodesToWriter(StreamingEncoder baseEncoder, List<StreamingEncoder> additionalEncoders, boolean applyAdditionalFirst) {
boolean baseEncoderShouldBeApplied = ChainedEncoders.shouldApplyEncoder(baseEncoder);
List<StreamingEncoder> allEncoders=new ArrayList<StreamingEncoder>(additionalEncoders.size()+1);
if(!applyAdditionalFirst && baseEncoderShouldBeApplied) {
allEncoders.add(baseEncoder);
}
for(StreamingEncoder additional : additionalEncoders) {
if(ChainedEncoders.shouldApplyEncoder(additional)) {
allEncoders.add(additional);
}
}
if(applyAdditionalFirst && baseEncoderShouldBeApplied) {
allEncoders.add(baseEncoder);
}
return new EncodesToWriterAdapter(ChainedEncoder.createFor(allEncoders));
}
}