com.spoledge.audao.parser.gql.impl.soft.SoftColumnExpr.java Source code

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Here is the source code for com.spoledge.audao.parser.gql.impl.soft.SoftColumnExpr.java

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/*
 * Copyright 2010 Spolecne s.r.o. (www.spoledge.com)
 *
 * 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 com.spoledge.audao.parser.gql.impl.soft;

import org.antlr.runtime.*;
import org.antlr.runtime.tree.*;

import org.apache.commons.logging.LogFactory;

import com.google.appengine.api.datastore.Entity;

import com.spoledge.audao.parser.gql.impl.GqlExtExprTree;

public class SoftColumnExpr extends SoftColumn {
    private CommonTree tree;

    ////////////////////////////////////////////////////////////////////////////
    // Constructors
    ////////////////////////////////////////////////////////////////////////////

    /**
     * Special constructor for evaluating expressions only - used in soft conditions.
     */
    public SoftColumnExpr(CommonTree tree) {
        this(tree, null, false, false);
    }

    public SoftColumnExpr(CommonTree tree, SoftColumn sc) {
        this(tree, sc.getColumnName(), sc.isUnindexed(), sc.isEmpty());
    }

    public SoftColumnExpr(CommonTree tree, String columnName, boolean isUnindexed, boolean isEmpty) {
        super(columnName, isUnindexed, isEmpty);

        this.tree = tree;
    }

    ////////////////////////////////////////////////////////////////////////////
    // Public
    ////////////////////////////////////////////////////////////////////////////

    @Override
    public Object getValue(Object[] args, Entity ent) {
        // walk the subtree

        GqlExtExprTree parser = new GqlExtExprTree(new CommonTreeNodeStream(tree));

        try {
            return parser.expr(args, ent);
        } catch (RecognitionException e) {
            LogFactory.getLog(getClass()).error("getValue(): " + e + ", tree=" + tree.toStringTree());

            throw new RuntimeException(e);
        } catch (RuntimeException e) {
            LogFactory.getLog(getClass()).error("getValue(): tree=" + tree.toStringTree(), e);

            throw e;
        }
    }
}