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Groovy example source code file (GroovyRowResult.java)

This example Groovy source code file (GroovyRowResult.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

collection, exception, exception, groovyobjectsupport, groovyrowresult, iterator, map, map, missingpropertyexception, object, object, set, string, string, util

The Groovy GroovyRowResult.java source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * 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 groovy.sql;

import groovy.lang.GroovyObjectSupport;
import groovy.lang.MissingPropertyException;

import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

/**
 * Represents an extent of objects.
 * It's used in the oneRow method to be able to access the result
 * of a SQL query by the name of the column, or by the column number.
 *
 * @version $Revision: 16759 $
 * @author Jean-Louis Berliet
 */
public class GroovyRowResult extends GroovyObjectSupport implements Map {

    private final Map result;

    public GroovyRowResult(Map result) {
        this.result = result;
    }

    /**
     * Retrieve the value of the property by its name
     *
     * @param property is the name of the property to look at
     * @return the value of the property
     */
    public Object getProperty(String property) {
        try {
            Object value = result.get(property);
            if (value != null)
                return value;
            // if property exists and value is null, return null
            if (result.containsKey(property))
                return null;
            // with some databases/drivers, the columns names are stored uppercase.
            String propertyUpper = property.toUpperCase();
            value = result.get(propertyUpper);
            if (value != null)
                return value;
            // if property exists and value is null, return null
            if (result.containsKey(propertyUpper)) 
                return null;
            throw new MissingPropertyException(property, GroovyRowResult.class);
        }
        catch (Exception e) {
            throw new MissingPropertyException(property, GroovyRowResult.class, e);
        }
    }

    /**
     * Retrieve the value of the property by its index.
     * A negative index will count backwards from the last column.
     *
     * @param index is the number of the column to look at
     * @return the value of the property
     */
    public Object getAt(int index) {
        try {
            // a negative index will count backwards from the last column.
            if (index < 0)
                index += result.size();
            Iterator it = result.values().iterator();
            int i = 0;
            Object obj = null;
            while ((obj == null) && (it.hasNext())) {
                if (i == index)
                    obj = it.next();
                else
                    it.next();
                i++;
            }
            return (obj);
        }
        catch (Exception e) {
            throw new MissingPropertyException(Integer.toString(index), GroovyRowResult.class, e);
        }
    }

    public String toString() {
        return (result.toString());
    }

    /*
     * The following methods are needed for implementing the Map interface.
     * They are just delegating the request to the internal LinkedHashMap
     */
     
    public void clear() {
        result.clear();
    }

    public boolean containsKey(Object key) {
        return result.containsKey(key);
    }

    public boolean containsValue(Object value) {
        return result.containsValue(value);
    }

    public Set entrySet() {
        return result.entrySet();
    }

    public boolean equals(Object o) {
        return result.equals(o);
    }

    public Object get(Object property) {
        if (property instanceof String)
            return getProperty((String)property);
        else
            return null;
    }

    public int hashCode() {
        return result.hashCode();
    }

    public boolean isEmpty() {
        return result.isEmpty();
    }

    public Set keySet() {
        return result.keySet();
    }

    public Object put(Object key, Object value) {
        return result.put(key, value);
    }

    public void putAll(Map t) {
        result.putAll(t);
    }

    public Object remove(Object key) {
        return result.remove(key);
    }

    public int size() {
        return result.size();
    }

    public Collection values() {
        return result.values();
    }
}

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