lucee.transformer.bytecode.cast.CastBoolean.java Source code

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Here is the source code for lucee.transformer.bytecode.cast.CastBoolean.java

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/**
 *
 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either 
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public 
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 * 
 **/
package lucee.transformer.bytecode.cast;

import lucee.runtime.exp.TemplateException;
import lucee.transformer.bytecode.BytecodeContext;
import lucee.transformer.bytecode.BytecodeException;
import lucee.transformer.bytecode.Literal;
import lucee.transformer.bytecode.expression.ExprBoolean;
import lucee.transformer.bytecode.expression.ExprDouble;
import lucee.transformer.bytecode.expression.ExprString;
import lucee.transformer.bytecode.expression.Expression;
import lucee.transformer.bytecode.expression.ExpressionBase;
import lucee.transformer.bytecode.literal.LitBoolean;
import lucee.transformer.bytecode.util.Methods;
import lucee.transformer.bytecode.util.Types;

import org.objectweb.asm.Type;
import org.objectweb.asm.commons.GeneratorAdapter;
import org.objectweb.asm.commons.Method;

/**
 * Cast to a Boolean
 */
public final class CastBoolean extends ExpressionBase implements ExprBoolean, Cast {

    /**
    * @see java.lang.Object#toString()
    */
    public String toString() {
        return "(boolean)" + expr;
    }

    private Expression expr;

    /**
     * constructor of the class
     * @param expr
     */
    private CastBoolean(Expression expr) {
        super(expr.getStart(), expr.getEnd());
        this.expr = expr;
    }

    /**
     * Create a String expression from a Expression
     * @param expr
     * @return String expression
     * @throws TemplateException 
     */
    public static ExprBoolean toExprBoolean(Expression expr) {
        if (expr instanceof ExprBoolean)
            return (ExprBoolean) expr;
        if (expr instanceof Literal) {
            Boolean bool = ((Literal) expr).getBoolean(null);
            if (bool != null)
                return new LitBoolean(bool.booleanValue(), expr.getStart(), expr.getEnd());
            // TODO throw new TemplateException("can't cast value to a boolean value");
        }
        return new CastBoolean(expr);
    }

    /**
     * @see lucee.transformer.bytecode.expression.Expression#writeOut(org.objectweb.asm.commons.GeneratorAdapter, int)
     */
    public Type _writeOut(BytecodeContext bc, int mode) throws BytecodeException {
        GeneratorAdapter adapter = bc.getAdapter();
        if (expr instanceof ExprDouble) {
            expr.writeOut(bc, MODE_VALUE);
            if (mode == MODE_VALUE)
                adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_VALUE_FROM_DOUBLE);
            else
                adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_FROM_DOUBLE);
        } else if (expr instanceof ExprString) {
            expr.writeOut(bc, MODE_REF);
            if (mode == MODE_VALUE)
                adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_VALUE_FROM_STRING);
            else
                adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_FROM_STRING);
        } else {
            Type rtn = expr.writeOut(bc, mode);

            if (mode == MODE_VALUE) {
                if (!Types.isPrimitiveType(rtn)) {
                    adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_VALUE);
                } else if (Types.BOOLEAN_VALUE.equals(rtn)) {
                } else if (Types.DOUBLE_VALUE.equals(rtn)) {
                    adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_VALUE_FROM_DOUBLE);
                } else {
                    adapter.invokeStatic(Types.CASTER,
                            new Method("toRef", Types.toRefType(rtn), new Type[] { rtn }));
                    adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN_VALUE);
                }
                //return Types.BOOLEAN_VALUE;
            } else {
                if (Types.BOOLEAN.equals(rtn)) {
                } else
                    adapter.invokeStatic(Types.CASTER, Methods.METHOD_TO_BOOLEAN);
            }
        }

        if (mode == MODE_VALUE)
            return Types.BOOLEAN_VALUE;
        return Types.BOOLEAN;
    }

    @Override
    public Expression getExpr() {
        return expr;
    }
}