/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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 com.querydsl.core;
import javax.annotation.Nullable;
import com.querydsl.core.types.Constant;
import com.querydsl.core.types.ConstantImpl;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.Visitor;
import com.querydsl.core.types.dsl.BooleanExpression;
import com.querydsl.core.types.dsl.NumberExpression;
import com.querydsl.core.types.dsl.SimpleExpression;
import com.querydsl.core.types.dsl.StringExpression;
/**
* StringConstant represents String constants
*
* @author tiwe
*
*/
public final class StringConstant extends StringExpression implements Constant<String> {
private static final long serialVersionUID = 5182804405789674556L;
public static StringExpression create(String str) {
return new StringConstant(str);
}
private final String constant;
@Nullable
private transient volatile NumberExpression<Integer> length;
@Nullable
private transient volatile StringExpression lower, trim, upper;
StringConstant(String constant) {
super(ConstantImpl.create(constant));
this.constant = constant;
}
@Override
public <R,C> R accept(Visitor<R,C> v, C context) {
return v.visit(this, context);
}
@Override
public StringExpression append(Expression<String> s) {
if (s instanceof Constant<?>) {
return append(((Constant<String>) s).getConstant());
} else {
return super.append(s);
}
}
@Override
public StringExpression append(String s) {
return new StringConstant(constant + s);
}
@Override
public SimpleExpression<Character> charAt(int i) {
return SimpleConstant.create(constant.charAt(i));
}
@Override
public StringExpression concat(String s) {
return append(s);
}
@Override
public BooleanExpression eq(String s) {
return BooleanConstant.create(constant.equals(s));
}
@Override
public BooleanExpression equalsIgnoreCase(String str) {
return BooleanConstant.create(constant.equalsIgnoreCase(str));
}
@Override
public String getConstant() {
return constant;
}
@Override
public BooleanExpression isEmpty() {
return BooleanConstant.create(constant.isEmpty());
}
@Override
public BooleanExpression isNotEmpty() {
return BooleanConstant.create(!constant.isEmpty());
}
@Override
public NumberExpression<Integer> length() {
if (length == null) {
length = NumberConstant.create(constant.length());
}
return length;
}
@Override
public StringExpression lower() {
if (lower == null) {
lower = new StringConstant(constant.toLowerCase());
}
return lower;
}
@Override
public BooleanExpression matches(String pattern) {
return BooleanConstant.create(constant.matches(pattern));
}
@Override
public BooleanExpression ne(String s) {
return BooleanConstant.create(!constant.equals(s));
}
@Override
public StringExpression prepend(Expression<String> s) {
if (s instanceof Constant<?>) {
return prepend(((Constant<String>) s).getConstant());
} else {
return super.prepend(s);
}
}
@Override
public StringExpression prepend(String s) {
return new StringConstant(s + constant);
}
@Override
public StringExpression substring(int beginIndex) {
return new StringConstant(constant.substring(beginIndex));
}
@Override
public StringExpression substring(int beginIndex, int endIndex) {
return new StringConstant(constant.substring(beginIndex, endIndex));
}
@Override
public StringExpression toLowerCase() {
return lower();
}
@Override
public StringExpression toUpperCase() {
return upper();
}
@Override
public StringExpression trim() {
if (trim == null) {
trim = new StringConstant(constant.trim());
}
return trim;
}
@Override
public StringExpression upper() {
if (upper == null) {
upper = new StringConstant(constant.toUpperCase());
}
return upper;
}
}