/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.wicket.util.parse.metapattern.parsers;
import org.apache.wicket.util.parse.metapattern.Group;
import org.apache.wicket.util.parse.metapattern.MetaPattern;
import org.apache.wicket.util.parse.metapattern.OptionalMetaPattern;
/**
* Parses key value assignment statements like "foo=bar" but also supporting namespaces like
* "wicket:foo=bar". However the 'key' value returned will contain "wicket:foo". It does not
* separate namespace and name.
*
* @author Jonathan Locke
*/
public final class VariableAssignmentParser extends MetaPatternParser
{
/** The optional namespace like "namespace:*" */
private static final MetaPattern namespace = new OptionalMetaPattern(new MetaPattern[] {
MetaPattern.VARIABLE_NAME, MetaPattern.COLON });
/** The key (lvalue) like "name" or "namespace:name" */
private final Group key = new Group(new MetaPattern(new MetaPattern[] { namespace,
MetaPattern.XML_ATTRIBUTE_NAME }));
/** The rvalue of the assignment */
private final Group value;
/**
* Construct a variable assignment parser against a given input character sequence
*
* @param input
* The input to parse
*/
public VariableAssignmentParser(final CharSequence input)
{
this(input, MetaPattern.STRING);
}
/**
* Construct a variable assignment parser against a given input character sequence
*
* @param input
* The input to parse
* @param valuePattern
* Value pattern
*/
public VariableAssignmentParser(final CharSequence input, final MetaPattern valuePattern)
{
super(input);
// Create group for value pattern
value = new Group(valuePattern);
// Pattern for =<value>
final MetaPattern variableAssignment = new MetaPattern(new MetaPattern[] {
MetaPattern.OPTIONAL_WHITESPACE, MetaPattern.EQUALS,
MetaPattern.OPTIONAL_WHITESPACE, value });
// Set parse pattern to <key>=<value>?
setPattern(new MetaPattern(new MetaPattern[] { MetaPattern.OPTIONAL_WHITESPACE, key,
new OptionalMetaPattern(variableAssignment), MetaPattern.OPTIONAL_WHITESPACE }));
}
/**
* Gets the key part (eg 'foo' in 'foo=bar'). The key will include the optional namespace (eg
* 'html:foo' in 'html:foo=bar').
*
* @return The key part
*/
public String getKey()
{
return key.get(matcher());
}
/**
* Gets the value part (eg 'bar' in 'foo=bar').
*
* @return The value part
*/
public String getValue()
{
return value.get(matcher());
}
}