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camundafeel.de.odysseus.el.tree.impl.ast.AstBinary Maven / Gradle / Ivy
/*
* Copyright 2006-2009 Odysseus Software GmbH
*
* 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 de.odysseus.el.tree.impl.ast;
import javax.el.ELContext;
import de.odysseus.el.misc.BooleanOperations;
import de.odysseus.el.misc.NumberOperations;
import de.odysseus.el.misc.TypeConverter;
import de.odysseus.el.tree.Bindings;
public class AstBinary extends AstRightValue {
public interface Operator {
public Object eval(Bindings bindings, ELContext context, AstNode left, AstNode right);
}
public static abstract class SimpleOperator implements Operator {
public Object eval(Bindings bindings, ELContext context, AstNode left, AstNode right) {
return apply(bindings, left.eval(bindings, context), right.eval(bindings, context));
}
protected abstract Object apply(TypeConverter converter, Object o1, Object o2);
}
public static final Operator ADD = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return NumberOperations.add(converter, o1, o2); }
@Override public String toString() { return "+"; }
};
public static final Operator AND = new Operator() {
public Object eval(Bindings bindings, ELContext context, AstNode left, AstNode right) {
Boolean l = bindings.convert(left.eval(bindings, context), Boolean.class);
return Boolean.TRUE.equals(l) ? bindings.convert(right.eval(bindings, context), Boolean.class) : Boolean.FALSE;
}
@Override public String toString() { return "&&"; }
};
public static final Operator DIV = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return NumberOperations.div(converter, o1, o2); }
@Override public String toString() { return "/"; }
};
public static final Operator EQ = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.eq(converter, o1, o2); }
@Override public String toString() { return "=="; }
};
public static final Operator GE = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.ge(converter, o1, o2); }
@Override public String toString() { return ">="; }
};
public static final Operator GT = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.gt(converter, o1, o2); }
@Override public String toString() { return ">"; }
};
public static final Operator LE = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.le(converter, o1, o2); }
@Override public String toString() { return "<="; }
};
public static final Operator LT = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.lt(converter, o1, o2); }
@Override public String toString() { return "<"; }
};
public static final Operator MOD = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return NumberOperations.mod(converter, o1, o2); }
@Override public String toString() { return "%"; }
};
public static final Operator MUL = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return NumberOperations.mul(converter, o1, o2); }
@Override public String toString() { return "*"; }
};
public static final Operator NE = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return BooleanOperations.ne(converter, o1, o2); }
@Override public String toString() { return "!="; }
};
public static final Operator OR = new Operator() {
public Object eval(Bindings bindings, ELContext context, AstNode left, AstNode right) {
Boolean l = bindings.convert(left.eval(bindings, context), Boolean.class);
return Boolean.TRUE.equals(l) ? Boolean.TRUE : bindings.convert(right.eval(bindings, context), Boolean.class);
}
@Override public String toString() { return "||"; }
};
public static final Operator SUB = new SimpleOperator() {
@Override public Object apply(TypeConverter converter, Object o1, Object o2) { return NumberOperations.sub(converter, o1, o2); }
@Override public String toString() { return "-"; }
};
private final Operator operator;
private final AstNode left, right;
public AstBinary(AstNode left, AstNode right, Operator operator) {
this.left = left;
this.right = right;
this.operator = operator;
}
public Operator getOperator() {
return operator;
}
@Override
public Object eval(Bindings bindings, ELContext context) {
return operator.eval(bindings, context, left, right);
}
@Override
public String toString() {
return "'" + operator.toString() + "'";
}
@Override
public void appendStructure(StringBuilder b, Bindings bindings) {
left.appendStructure(b, bindings);
b.append(' ');
b.append(operator);
b.append(' ');
right.appendStructure(b, bindings);
}
public int getCardinality() {
return 2;
}
public AstNode getChild(int i) {
return i == 0 ? left : i == 1 ? right : null;
}
}
