Examples with JavaWhileBlockDescr org.drools.compiler.rule.builder.dialect.java.parser.JavaWhileBlockDescr used on opensource projects

Example 1 with JavaWhileBlockDescr

use of org.drools.compiler.rule.builder.dialect.java.parser.JavaWhileBlockDescr in project drools by kiegroup.

the class DialectUtil method setContainerBlockInputs.

/**
 * This code is not currently used, it's commented out in method caller. This is because we couldn't
 * get this to work and will have to wait until MVEL supports genercs (mdp).
 */
public static void setContainerBlockInputs(RuleBuildContext context, List<JavaBlockDescr> descrs, JavaContainerBlockDescr parentBlock, String originalCode, BoundIdentifiers bindings, Map<String, Class<?>> parentVars, int offset) {
    StringBuilder consequence = new StringBuilder();
    int lastAdded = 0;
    // strip blocks, so we can analyse this block with MVEL
    for (JavaBlockDescr block : parentBlock.getJavaBlockDescrs()) {
        if (block.getEnd() == 0) {
            // do nothing, it was incorrectly parsed, but this error should be picked up else where
            continue;
        }
        if (block.getType() == JavaBlockDescr.BlockType.TRY) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaTryBlockDescr tryDescr = (JavaTryBlockDescr) block;
            if (tryDescr.getFinal() != null) {
                lastAdded = tryDescr.getFinal().getEnd() - offset;
            } else {
                lastAdded = tryDescr.getCatches().get(tryDescr.getCatches().size() - 1).getEnd() - offset;
            }
            stripTryDescr(originalCode, consequence, (JavaTryBlockDescr) block, offset);
        } else if (block.getType() == JavaBlockDescr.BlockType.THROW) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaThrowBlockDescr throwBlock = (JavaThrowBlockDescr) block;
            addWhiteSpaces(originalCode, consequence, throwBlock.getStart() - offset, throwBlock.getTextStart() - offset);
            consequence.append(originalCode.substring(throwBlock.getTextStart() - offset - 1, throwBlock.getEnd() - 1 - offset)).append(";");
            lastAdded = throwBlock.getEnd() - offset;
        } else if (block.getType() == JavaBlockDescr.BlockType.IF) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaIfBlockDescr ifDescr = (JavaIfBlockDescr) block;
            lastAdded = ifDescr.getEnd() - offset;
            stripBlockDescr(originalCode, consequence, ifDescr, offset);
        } else if (block.getType() == JavaBlockDescr.BlockType.ELSE) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaElseBlockDescr elseDescr = (JavaElseBlockDescr) block;
            lastAdded = elseDescr.getEnd() - offset;
            stripBlockDescr(originalCode, consequence, elseDescr, offset);
        } else if (block.getType() == JavaBlockDescr.BlockType.WHILE) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaWhileBlockDescr whileDescr = (JavaWhileBlockDescr) block;
            lastAdded = whileDescr.getEnd() - offset;
            stripBlockDescr(originalCode, consequence, whileDescr, offset);
        } else if (block.getType() == JavaBlockDescr.BlockType.FOR) {
            // adding previous chunk up to the start of this block
            consequence.append(originalCode.substring(lastAdded, block.getStart() - 1 - offset));
            JavaForBlockDescr forDescr = (JavaForBlockDescr) block;
            lastAdded = forDescr.getEnd() - offset;
            stripBlockDescr(originalCode, consequence, forDescr, offset);
        }
    }
    consequence.append(originalCode.substring(lastAdded));
    // We need to do this as MVEL doesn't recognise "modify"
    MacroProcessor macroProcessor = new MacroProcessor();
    Map<String, Macro> macros = new HashMap<String, Macro>(MVELConsequenceBuilder.macros);
    macros.put("modify", new Macro() {

        public String doMacro() {
            return "with  ";
        }
    });
    macroProcessor.setMacros(macros);
    String mvelCode = macroProcessor.parse(consequence.toString());
    Map<String, Class<?>> inputs = getInputs(context, mvelCode, bindings, parentVars);
    inputs.putAll(parentVars);
    parentBlock.setInputs(inputs);
    // set inputs for current container blocks to be rewritten
    for (JavaBlockDescr block : parentBlock.getJavaBlockDescrs()) {
        if (block.getType() == JavaBlockDescr.BlockType.TRY) {
            JavaTryBlockDescr tryBlock = (JavaTryBlockDescr) block;
            setContainerBlockInputs(context, descrs, tryBlock, originalCode.substring(tryBlock.getTextStart() - offset, tryBlock.getEnd() - 1 - offset), bindings, inputs, tryBlock.getTextStart());
            for (JavaCatchBlockDescr catchBlock : tryBlock.getCatches()) {
                setContainerBlockInputs(context, descrs, catchBlock, catchBlock.getClause() + "=null;" + originalCode.substring(catchBlock.getTextStart() - offset, catchBlock.getEnd() - 1 - offset), bindings, inputs, tryBlock.getTextStart());
            }
            if (tryBlock.getFinal() != null) {
                JavaFinalBlockDescr finalBlock = tryBlock.getFinal();
                setContainerBlockInputs(context, descrs, finalBlock, originalCode.substring(finalBlock.getTextStart() - offset, finalBlock.getEnd() - 1 - offset), bindings, inputs, tryBlock.getTextStart());
            }
        } else if (block.getType() == JavaBlockDescr.BlockType.IF) {
            JavaIfBlockDescr ifBlock = (JavaIfBlockDescr) block;
            int adjustBlock = (originalCode.charAt(ifBlock.getTextStart() - offset - 1) == '{') ? 0 : 1;
            setContainerBlockInputs(context, descrs, ifBlock, originalCode.substring(ifBlock.getTextStart() - offset + adjustBlock, ifBlock.getEnd() - 1 - offset - adjustBlock), bindings, inputs, ifBlock.getTextStart());
        } else if (block.getType() == JavaBlockDescr.BlockType.ELSE) {
            JavaElseBlockDescr elseBlock = (JavaElseBlockDescr) block;
            int adjustBlock = (originalCode.charAt(elseBlock.getTextStart() - offset - 1) == '{') ? 0 : 1;
            setContainerBlockInputs(context, descrs, elseBlock, originalCode.substring(elseBlock.getTextStart() - offset + adjustBlock, elseBlock.getEnd() - 1 - offset - adjustBlock), bindings, inputs, elseBlock.getTextStart());
        } else if (block.getType() == JavaBlockDescr.BlockType.WHILE) {
            JavaWhileBlockDescr whileBlock = (JavaWhileBlockDescr) block;
            int adjustBlock = (originalCode.charAt(whileBlock.getTextStart() - offset - 1) == '{') ? 0 : 1;
            setContainerBlockInputs(context, descrs, whileBlock, originalCode.substring(whileBlock.getTextStart() - offset + adjustBlock, whileBlock.getEnd() - 1 - offset - adjustBlock), bindings, inputs, whileBlock.getTextStart());
        } else if (block.getType() == JavaBlockDescr.BlockType.FOR) {
            JavaForBlockDescr forBlock = (JavaForBlockDescr) block;
            int adjustBlock = (originalCode.charAt(forBlock.getTextStart() - offset - 1) == '{') ? 0 : 1;
            setContainerBlockInputs(context, descrs, forBlock, originalCode.substring(forBlock.getStartParen() - offset, forBlock.getInitEnd() - offset) + originalCode.substring(forBlock.getTextStart() - offset + adjustBlock, forBlock.getEnd() - 1 - offset - adjustBlock), bindings, inputs, forBlock.getTextStart() - (forBlock.getInitEnd() - forBlock.getStartParen()));
        } else {
            // each block to be rewritten now knows it's own variables
            block.setInputs(inputs);
            descrs.add(block);
        }
    }
}