/*
* Copyright (c) 2007 BUSINESS OBJECTS SOFTWARE LIMITED
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Business Objects nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* RTRecordSelection.java
* Created: Apr 7, 2004
* By: Bo Ilic
*/
package org.openquark.cal.internal.runtime.lecc;
import org.openquark.cal.runtime.CALExecutorException;
import org.openquark.cal.runtime.CalValue;
/**
* Represents record selection in a lazy context.
*
* For example, if
* projection x y = y;
* then
* projection (error "this should not be evaluated").field1 10.0
* should not result in the error function being called and just return 10.0.
*
* Conceptually one can think of RTRecordSelection as implementing the fully saturated reduction:
* recordSelection recordExpr fieldName = recordExpr.fieldName;
*
* @author Bo Ilic
*/
public abstract class RTRecordSelection extends RTResultFunction {
/** an expression which when evaluated is guaranteed by the compiler to be a record value */
private RTValue recordExpr;
public final static class Ordinal extends RTRecordSelection {
private int ordinal;
public Ordinal(RTValue recordExpr, int ordinal) {
super(recordExpr);
this.ordinal = ordinal;
}
/*
* (non-Javadoc)
*
* @see org.openquark.cal.internal.runtime.lecc.RTValue#unwind()
*/
@Override
protected final RTValue reduce(RTExecutionContext ec) throws CALExecutorException {
// Update and return result
if (super.recordExpr != null) {
setResult(((RTRecordValue) super.recordExpr.evaluate(ec)).getOrdinalFieldValue(ordinal));
clearMembers();
if (result == null) {
throw new NullPointerException ("Invalid reduction state in record selection. This is probably caused by a circular record definition.");
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see org.openquark.cal.internal.runtime.lecc.RTResultFunction#clearMembers()
*/
@Override
public void clearMembers() {
super.recordExpr = null;
}
/**
* {@inheritDoc}
*/
@Override
String getFieldName() {
return "#" + ordinal;
}
}
public final static class Textual extends RTRecordSelection {
private String textualFieldName;
public Textual(RTValue recordExpr, String textualFieldName) {
super(recordExpr);
this.textualFieldName = textualFieldName;
}
/*
* (non-Javadoc)
*
* @see org.openquark.cal.internal.runtime.lecc.RTValue#unwind()
*/
@Override
protected final RTValue reduce(RTExecutionContext ec) throws CALExecutorException {
// Update and return result
if (super.recordExpr != null) {
setResult(((RTRecordValue) super.recordExpr.evaluate(ec)).getTextualFieldValue(textualFieldName));
clearMembers();
if (result == null) {
throw new NullPointerException ("Invalid reduction state in record selection. This is probably caused by a circular record definition.");
}
}
return result;
}
/*
* (non-Javadoc)
*
* @see org.openquark.cal.internal.runtime.lecc.RTResultFunction#clearMembers()
*/
@Override
public void clearMembers() {
super.recordExpr = null;
textualFieldName = null;
}
/**
* {@inheritDoc}
*/
@Override
String getFieldName() {
return textualFieldName;
}
}
private RTRecordSelection(RTValue recordExpr) {
this.recordExpr = recordExpr;
}
abstract String getFieldName();
/**
* {@inheritDoc}
*/
@Override
public final int debug_getNChildren() {
if (result != null) {
return super.debug_getNChildren();
}
return 1;
}
/**
* {@inheritDoc}
*/
@Override
public final CalValue debug_getChild(int childN) {
if (result != null) {
return super.debug_getChild(childN);
}
switch (childN) {
case 0:
return recordExpr;
default:
throw new IndexOutOfBoundsException();
}
}
/**
* {@inheritDoc}
*/
@Override
public final String debug_getNodeStartText() {
if (result != null) {
return super.debug_getNodeStartText();
}
return "";
}
/**
* {@inheritDoc}
*/
@Override
public final String debug_getNodeEndText() {
if (result != null) {
return super.debug_getNodeEndText();
}
return "." + getFieldName();
}
/**
* {@inheritDoc}
*/
@Override
public final String debug_getChildPrefixText(int childN) {
if (result != null) {
return super.debug_getChildPrefixText(childN);
}
if (childN == 0) {
return "";
}
throw new IndexOutOfBoundsException();
}
}