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StringParameterValue.java
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StringParameterValue.java
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/**
* Copyright (C) 2016 Czech Technical University in Prague
* <p>
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
* <p>
* This program 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 General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.query.parameter;
import java.util.Objects;
class StringParameterValue implements ParameterValue {
private final String value;
private final String language;
StringParameterValue(String value) {
this.value = Objects.requireNonNull(value);
this.language = null;
}
StringParameterValue(String value, String language) {
this.value = Objects.requireNonNull(value);
this.language = language;
}
@Override
public String getValue() {
return value;
}
public String getLanguage() {
return language;
}
@Override
public String getQueryString() {
return "\"" + getEscapedValue() + "\"" + (language != null ? ("@" + language) : "");
}
/**
* Escapes string characters according to SPARQL spec.
*
* @return Escaped value
* @see <a href="https://www.w3.org/TR/sparql11-query/#grammarEscapes" target="_top">
* https://www.w3.org/TR/sparql11-query/#grammarEscapes</a>
*/
private String getEscapedValue() {
final StringBuilder sb = new StringBuilder(value.length());
char c;
for (int i = 0; i < value.length(); i++) {
c = value.charAt(i);
switch (c) {
case '\t':
sb.append("\\t");
break;
case '\n':
sb.append("\\n");
break;
case '\r':
sb.append("\\r");
break;
case '\b':
sb.append("\\b");
break;
case '\f':
sb.append("\\f");
break;
case '\'':
sb.append("\\\'");
break;
case '\"':
sb.append("\\\"");
break;
case '\\':
sb.append("\\\\");
break;
default:
sb.append(c);
}
}
return sb.toString();
}
}