java.fedora.server.search.Condition Maven / Gradle / Ivy
/*
* -----------------------------------------------------------------------------
*
* License and Copyright: The contents of this file are subject to 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.fedora-commons.org/licenses.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
* the specific language governing rights and limitations under the License.
*
* The entire file consists of original code.
* Copyright © 2008 Fedora Commons, Inc.
*
Copyright © 2002-2007 The Rector and Visitors of the University of
* Virginia and Cornell University
* All rights reserved.
*
* -----------------------------------------------------------------------------
*/
package fedora.server.search;
import java.util.ArrayList;
import java.util.List;
import fedora.server.errors.InvalidOperatorException;
import fedora.server.errors.QueryParseException;
/**
*
* Title: Condition.java
* Description:
*
* @author [email protected]
* @version $Id: Condition.java 5218 2006-11-20 05:10:11Z cwilper $
*/
public class Condition {
private String m_property;
private Operator m_operator;
private String m_value;
public Condition(String property, Operator operator, String value)
throws QueryParseException {
m_property=property;
m_operator=operator;
if (value.indexOf("'")!=-1) {
throw new QueryParseException("Query cannot contain the ' character.");
}
m_value=value;
}
public Condition(String property, String operator, String value)
throws InvalidOperatorException, QueryParseException {
m_property=property;
if (operator.equals("eq")) {
m_operator=new Operator("=", "eq");
} else if (operator.equals("has")) {
m_operator=new Operator("~", "has");
} else if (operator.equals("gt")) {
m_operator=new Operator(">", "gt");
} else if (operator.equals("ge")) {
m_operator=new Operator(">=", "ge");
} else if (operator.equals("lt")) {
m_operator=new Operator("<", "lt");
} else if (operator.equals("le")) {
m_operator=new Operator("<=", "le");
} else {
throw new InvalidOperatorException("Operator, '" + operator + "' does "
+ "not match one of eq, has, gt, ge, lt, or le.");
}
if (value.indexOf("'")!=-1) {
throw new QueryParseException("Query cannot contain the ' character.");
}
m_value=value;
}
/**
* Gets a List of Conditions from a string like: a=x b~'that\'s' c>='z'
*
* @param query The query string.
* @return The Conditions.
*/
public static List getConditions(String query)
throws QueryParseException {
Operator EQUALS=new Operator("=", "eq");
Operator CONTAINS=new Operator("~", "has");
Operator GREATER_THAN=new Operator(">", "gt");
Operator GREATER_OR_EQUAL=new Operator(">=", "ge");
Operator LESS_THAN=new Operator("<", "lt");
Operator LESS_OR_EQUAL=new Operator("<=", "le");
StringBuffer prop=new StringBuffer();
Operator oper=null;
StringBuffer val=new StringBuffer();
ArrayList ret=new ArrayList();
boolean inProp=true;
boolean inValue=false;
boolean firstValueChar=false;
boolean valueStartsWithQuote=false;
for (int i=0; i at character " + i
+ " but expected or ");
} else if (c=='=') {
oper=EQUALS;
inProp=false;
inValue=true;
firstValueChar=true;
} else if (c=='~') {
oper=CONTAINS;
inProp=false;
inValue=true;
firstValueChar=true;
} else if (c=='>') {
if (i+1 "
+ "immediately following '>' operator, but "
+ "expected a value.");
}
} else if (c=='<') {
if (i+1 "
+ "immediately following '<' operator, but "
+ "expected a value.");
}
} else {
prop.append(c);
}
} else if (inValue) {
if (prop.toString().length()==0) {
throw new QueryParseException("Found "
+ "operator but expected a non-zero length "
+ "property.");
}
if (firstValueChar) {
// allow ', and mark it if it's there, add one to i
if (c=='\'') {
i++;
if (i>=query.length()) {
throw new QueryParseException("Found "
+ "immediately following start quote, but "
+ "expected a value.");
}
c=query.charAt(i);
valueStartsWithQuote=true;
}
firstValueChar=false;
}
if (c=='\'') {
if (!valueStartsWithQuote) {
throw new QueryParseException("Found ' character in "
+ "value at position " + i + ", but the value "
+ "did not start with a string, so this can't "
+ " be a value terminator.");
}
// end of value part
// next must be space or empty... check
i++;
if (i "
+ "or .");
}
}
ret.add(new Condition(prop.toString(), oper, val.toString()));
prop=new StringBuffer();
oper=null;
val=new StringBuffer();
inValue=false;
inProp=true;
valueStartsWithQuote=false;
} else if (c=='\\') {
i++;
if (i>=query.length()) {
throw new QueryParseException("Found character-escaping "
+ "character as last item in string.");
}
val.append(query.charAt(i));
} else if (c==' ') {
// end of value part... or inside string?
if (valueStartsWithQuote) {
// was inside string..ok
val.append(c);
} else {
// end of value part...cuz not quotes
ret.add(new Condition(prop.toString(), oper, val.toString()));
prop=new StringBuffer();
oper=null;
val=new StringBuffer();
inValue=false;
inProp=true;
}
} else if (c=='=') {
throw new QueryParseException("Found at position "
+ i + ", but expected ");
} else if (c=='~') {
throw new QueryParseException("Found at position "
+ i + ", but expected ");
} else if (c=='>') {
throw new QueryParseException("Found at position "
+ i + ", but expected ");
} else if (c=='<') {
throw new QueryParseException("Found at position "
+ i + ", but expected ");
} else {
val.append(c);
}
}
}
if (inProp) {
if (prop.toString().length()>0) {
throw new QueryParseException("String ended before operator "
+ "was found");
}
}
if (inValue) {
if (valueStartsWithQuote) {
throw new QueryParseException("String ended before quoted value"
+ "'s ending quote.");
}
ret.add(new Condition(prop.toString(), oper, val.toString()));
}
return ret;
}
public String getProperty() {
return m_property;
}
public Operator getOperator() {
return m_operator;
}
public String getValue() {
return m_value;
}
}
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