/*****************************************************************
* 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.cayenne.exp.parser;
import java.io.IOException;
import java.util.List;
import org.apache.cayenne.exp.Expression;
/**
* @since 4.0
*/
public abstract class ASTFunctionCall extends EvaluatedNode {
private String functionName;
ASTFunctionCall(int id, String functionName) {
super(id);
this.functionName = functionName;
}
public ASTFunctionCall(int id, String functionName, Object... nodes) {
this(id, functionName);
this.functionName = functionName;
int len = nodes.length;
for (int i = 0; i < len; i++) {
jjtAddChild(wrapChild(nodes[i]), i);
}
connectChildren();
}
@Override
public int getType() {
return Expression.FUNCTION_CALL;
}
public boolean needParenthesis() {
return true;
}
public String getFunctionName() {
return functionName;
}
@Override
protected String getExpressionOperator(int index) {
return ",";
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
ASTFunctionCall that = (ASTFunctionCall) o;
return functionName.equals(that.functionName);
}
@Override
public int hashCode() {
return 31 * super.hashCode() + functionName.hashCode();
}
protected void appendFunctionNameAsString(Appendable out) throws IOException {
out.append(nameToCamelCase(getFunctionName()));
}
@Override
public void appendAsString(Appendable out) throws IOException {
appendFunctionNameAsString(out);
if(parent == null) {
// else call to super method will append parenthesis
out.append("(");
}
super.appendAsString(out);
if(parent == null) {
out.append(")");
}
}
@Override
public void appendAsEJBQL(List<Object> parameterAccumulator, Appendable out, String rootId) throws IOException {
out.append(getFunctionName());
out.append("(");
super.appendChildrenAsEJBQL(parameterAccumulator, out, rootId);
out.append(")");
}
/**
*
* @param functionName in UPPER_UNDERSCORE convention
* @return functionName in camelCase convention
*/
protected static String nameToCamelCase(String functionName) {
String[] parts = functionName.split("_");
StringBuilder sb = new StringBuilder();
boolean first = true;
for(String part : parts) {
if(first) {
sb.append(part.toLowerCase());
first = false;
} else {
char[] chars = part.toLowerCase().toCharArray();
chars[0] = Character.toTitleCase(chars[0]);
sb.append(chars);
}
}
return sb.toString();
}
}