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/*
* SonarQube, open source software quality management tool.
* Copyright (C) 2008-2013 SonarSource
* mailto:contact AT sonarsource DOT com
*
* SonarQube is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* SonarQube is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonar.channel;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ChannelDispatcher<O> extends Channel<O> {
private static final Logger LOG = LoggerFactory.getLogger(ChannelDispatcher.class);
private final boolean failIfNoChannelToConsumeOneCharacter;
private final Channel<O>[] channels;
/**
* @deprecated in version 2.9. Please use the builder() method
*/
@SuppressWarnings("rawtypes")
@Deprecated
public ChannelDispatcher(List<Channel> channels) {
this(channels, false);
}
/**
* @deprecated in version 2.9. Please use the builder() method
*/
@SuppressWarnings("rawtypes")
@Deprecated
public ChannelDispatcher(Channel... channels) {
this(Arrays.asList(channels), false);
}
/**
* @deprecated in version 2.9. Please use the builder() method
*/
@SuppressWarnings("rawtypes")
@Deprecated
public ChannelDispatcher(List<Channel> channels, boolean failIfNoChannelToConsumeOneCharacter) {
this.channels = channels.toArray(new Channel[channels.size()]);
this.failIfNoChannelToConsumeOneCharacter = failIfNoChannelToConsumeOneCharacter;
}
private ChannelDispatcher(Builder builder) {
this.channels = builder.channels.toArray(new Channel[builder.channels.size()]);
this.failIfNoChannelToConsumeOneCharacter = builder.failIfNoChannelToConsumeOneCharacter;
}
@Override
public boolean consume(CodeReader code, O output) {
int nextChar = code.peek();
while (nextChar != -1) {
boolean characterConsumed = false;
for (Channel<O> channel : channels) {
if (channel.consume(code, output)) {
characterConsumed = true;
break;
}
}
if ( !characterConsumed) {
if (LOG.isDebugEnabled() || failIfNoChannelToConsumeOneCharacter) {
String message = "None of the channel has been able to handle character '" + (char) code.peek() + "' (decimal value "
+ code.peek() + ") at line " + code.getLinePosition() + ", column " + code.getColumnPosition();
if (failIfNoChannelToConsumeOneCharacter) {
throw new IllegalStateException(message);
}
LOG.debug(message);
}
code.pop();
}
nextChar = code.peek();
}
return true;
}
Channel[] getChannels() {
return channels;
}
/**
* Get a Builder instance to build a new ChannelDispatcher
*/
public static Builder builder() {
return new Builder();
}
public static final class Builder {
private List<Channel> channels = new ArrayList<Channel>();
private boolean failIfNoChannelToConsumeOneCharacter = false;
private Builder() {
}
public Builder addChannel(Channel channel) {
channels.add(channel);
return this;
}
public Builder addChannels(Channel... c) {
for (Channel channel : c) {
addChannel(channel);
}
return this;
}
/**
* If this option is activated, an IllegalStateException will be thrown as soon as a character won't be consumed by any channel.
*/
public Builder failIfNoChannelToConsumeOneCharacter() {
failIfNoChannelToConsumeOneCharacter = true;
return this;
}
public <O> ChannelDispatcher<O> build() {
return new ChannelDispatcher<O>(this);
}
}
}
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