org.ocpsoft.rewrite.param.RegexParameterizedPatternParser Maven / Gradle / Ivy
/*
* Copyright 2011 Lincoln Baxter, III
*
* 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.ocpsoft.rewrite.param;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.ocpsoft.common.util.Assert;
import org.ocpsoft.rewrite.context.EvaluationContext;
import org.ocpsoft.rewrite.event.Rewrite;
import org.ocpsoft.rewrite.util.ParseTools;
import org.ocpsoft.rewrite.util.ParseTools.CaptureType;
import org.ocpsoft.rewrite.util.ParseTools.CapturingGroup;
/**
* An {@link org.ocpsoft.rewrite.param.Parameterized} regular expression {@link Pattern}.
*
* @author Lincoln Baxter, III
*/
public class RegexParameterizedPatternParser implements ParameterizedPatternParser
{
private static final String DEFAULT_PARAMETER_PATTERN = ".*";
private Pattern compiledPattern;
private final String pattern;
private final char[] chars;
private final List groups = new ArrayList();
private RegexParameterizedPatternBuilder builder;
private String defaultParameterPattern;
private ParameterStore parameters;
RegexParameterizedPatternParser(RegexParameterizedPatternBuilder builder,
String defaultParameterPattern, String pattern)
{
this(defaultParameterPattern, pattern);
this.builder = builder;
}
/**
* Create a new {@link RegexParameterizedPatternParser} instance with the default
* {@link org.ocpsoft.rewrite.bind.parse.CaptureType#BRACE} and parameter pattern of ".*".
*/
public RegexParameterizedPatternParser(final String pattern)
{
this(CaptureType.BRACE, DEFAULT_PARAMETER_PATTERN, pattern);
}
/**
* Create a new {@link RegexParameterizedPatternParser} instance with the default {@link CaptureType#BRACE}.
*/
public RegexParameterizedPatternParser(final String parameterPattern, final String pattern)
{
this(CaptureType.BRACE, parameterPattern, pattern);
}
/**
* Create a new {@link RegexParameterizedPatternParser} instance with the default parameter regex of ".*".
*/
public RegexParameterizedPatternParser(final CaptureType type, final String pattern)
{
this(type, DEFAULT_PARAMETER_PATTERN, pattern);
}
/**
* Create a new {@link RegexParameterizedPatternParser} instance.
*/
public RegexParameterizedPatternParser(final CaptureType type, final String defaultParameterPattern,
final String pattern)
{
Assert.notNull(pattern, "Pattern must not be null");
this.defaultParameterPattern = defaultParameterPattern;
this.pattern = pattern;
chars = pattern.toCharArray();
if (chars.length > 0)
{
int parameterIndex = 0;
int cursor = 0;
while (cursor < chars.length)
{
switch (chars[cursor])
{
case '{':
int startPos = cursor;
CapturingGroup group = ParseTools.balancedCapture(chars, startPos, chars.length - 1, type);
cursor = group.getEnd();
groups.add(new RegexGroup(group, parameterIndex++));
break;
default:
break;
}
cursor++;
}
}
}
@Override
public boolean matches(String value)
{
return getMatcher(parameters, value).matches();
}
@Override
public boolean matches(final Rewrite event, final EvaluationContext context, final String value)
{
Matcher matcher = getMatcher(parameters, value);
boolean result = matcher.matches();
if (result == true)
{
ParameterValueStore valueStore = (ParameterValueStore) context.get(ParameterValueStore.class);
if (valueStore != null)
{
int group = 1;
for (RegexGroup param : groups)
{
String paramValue = matcher.group(group++);
Parameter globalParam = parameters.get(param.getName());
if (!valueStore.submit(event, context, globalParam, paramValue))
{
result = false;
break;
}
}
}
}
/*
* N-conditions with N-values for same parameter. If they are different, evaluation fails. If they are equal, we
* must create only one single binding operation.
*/
return result;
}
private Matcher getMatcher(ParameterStore parameters, final String value)
{
if (compiledPattern == null)
{
StringBuilder patternBuilder = new StringBuilder();
CapturingGroup last = null;
for (RegexGroup group : groups)
{
CapturingGroup capture = group.getCapture();
if ((last != null) && (last.getEnd() < capture.getStart() - 1))
{
patternBuilder.append(new char[] { '\\', 'Q' });
patternBuilder.append(Arrays.copyOfRange(chars, last.getEnd() + 1, capture.getStart()));
patternBuilder.append(new char[] { '\\', 'E' });
}
else if ((last == null) && (capture.getStart() > 0))
{
patternBuilder.append(new char[] { '\\', 'Q' });
patternBuilder.append(Arrays.copyOfRange(chars, 0, capture.getStart()));
patternBuilder.append(new char[] { '\\', 'E' });
}
patternBuilder.append('(');
StringBuilder parameterPatternBuilder = new StringBuilder();
if (parameters != null)
{
if (parameters.contains(group.getName()))
{
Iterator> iterator = parameters.get(group.getName()).getConstraints().iterator();
while (iterator.hasNext())
{
Constraint constraint = iterator.next();
if (constraint instanceof RegexConstraint)
{
parameterPatternBuilder.append("(?:");
parameterPatternBuilder.append(((RegexConstraint) constraint).getPattern());
parameterPatternBuilder.append(")");
if (iterator.hasNext())
parameterPatternBuilder.append("|");
}
}
}
}
if (parameterPatternBuilder.length() > 0)
patternBuilder.append(parameterPatternBuilder);
else
patternBuilder.append(defaultParameterPattern);
patternBuilder.append(')');
last = capture;
}
if ((last != null) && (last.getEnd() < chars.length))
{
patternBuilder.append(Arrays.copyOfRange(chars, last.getEnd() + 1, chars.length));
}
else if (last == null)
{
patternBuilder.append(new char[] { '\\', 'Q' });
patternBuilder.append(chars);
patternBuilder.append(new char[] { '\\', 'E' });
}
compiledPattern = Pattern.compile(patternBuilder.toString());
}
Matcher matcher = compiledPattern.matcher(value);
return matcher;
}
@Override
public Map, String> parse(String value)
{
Map, String> values = new LinkedHashMap, String>();
Matcher matcher = getMatcher(parameters, value);
if (matcher.matches())
{
for (RegexGroup group : groups)
{
values.put(parameters.get(group.getName()), matcher.group(group.getIndex() + 1));
}
}
return values;
}
@Override
public Map, String> parse(final Rewrite event,
final EvaluationContext context,
final String value)
{
Map, String> values = new LinkedHashMap, String>();
Matcher matcher = getMatcher(parameters, value);
if (matcher.matches())
{
for (RegexGroup group : groups)
{
values.put(parameters.get(group.getName()), matcher.group(group.getIndex() + 1));
}
}
return values;
}
@Override
public String toString()
{
return new String(chars);
}
@Override
public String getPattern()
{
return compiledPattern.pattern();
}
@Override
public ParameterizedPatternBuilder getBuilder()
{
if (builder == null)
{
builder = new RegexParameterizedPatternBuilder(pattern, this);
builder.setParameterStore(parameters);
}
return builder;
}
class RegexGroup
{
private final CapturingGroup capture;
private final int index;
public RegexGroup(final CapturingGroup capture, int index)
{
this.capture = capture;
this.index = index;
}
public int getIndex()
{
return index;
}
public String getName()
{
return new String(capture.getCaptured());
}
public CapturingGroup getCapture()
{
return capture;
}
@Override
public String toString()
{
return "RegexParameter [name=" + getName() + ", capture=" + capture + "]";
}
}
@Override
public Set getRequiredParameterNames()
{
Set result = new LinkedHashSet();
for (RegexGroup group : groups)
{
result.add(group.getName());
}
return result;
}
@Override
public void setParameterStore(ParameterStore store)
{
this.parameters = store;
}
}
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