org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc.java Source code

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Here is the source code for org.apache.hadoop.hive.ql.plan.ExprNodeConstantDesc.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.hadoop.hive.ql.plan;

import java.io.Serializable;
import java.util.List;

import org.apache.commons.lang.builder.HashCodeBuilder;
import org.apache.hadoop.hive.common.StringInternUtils;
import org.apache.hadoop.hive.serde.serdeConstants;
import org.apache.hadoop.hive.serde2.objectinspector.ConstantObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorUtils;
import org.apache.hadoop.hive.serde2.typeinfo.BaseCharTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.StructTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoUtils;

/**
 * A constant expression.
 */
public class ExprNodeConstantDesc extends ExprNodeDesc implements Serializable {
    private static final long serialVersionUID = 1L;
    final protected transient static char[] hexArray = "0123456789ABCDEF".toCharArray();
    private Object value;
    // If this constant was created while doing constant folding, foldedFromCol holds the name of
    // original column from which it was folded.
    private transient String foldedFromCol;
    // string representation of folding constant.
    private transient String foldedFromVal;

    public ExprNodeConstantDesc setFoldedFromVal(String foldedFromVal) {
        this.foldedFromVal = foldedFromVal;
        return this;
    }

    public String getFoldedFromVal() {
        return foldedFromVal;
    }

    public String getFoldedFromCol() {
        return foldedFromCol;
    }

    public void setFoldedFromCol(String foldedFromCol) {
        this.foldedFromCol = foldedFromCol;
    }

    public ExprNodeConstantDesc() {
    }

    public ExprNodeConstantDesc(TypeInfo typeInfo, Object value) {
        super(typeInfo);
        setValue(value);
    }

    public ExprNodeConstantDesc(Object value) {
        this(TypeInfoFactory.getPrimitiveTypeInfoFromJavaPrimitive(value.getClass()), value);
    }

    public void setValue(Object value) {
        // Kryo setter
        if (value instanceof String) {
            value = StringInternUtils.internIfNotNull((String) value);
        }
        this.value = value;
    }

    public Object getValue() {
        return value;
    }

    @Override
    public ConstantObjectInspector getWritableObjectInspector() {
        return ObjectInspectorUtils.getConstantObjectInspector(
                TypeInfoUtils.getStandardJavaObjectInspectorFromTypeInfo(typeInfo), value);
    }

    @Override
    public String toString() {
        return "Const " + typeInfo.toString() + " " + value;
    }

    private static String getFormatted(TypeInfo typeInfo, Object value) {
        if (value == null) {
            return "null";
        }

        if (typeInfo.getTypeName().equals(serdeConstants.STRING_TYPE_NAME)
                || typeInfo instanceof BaseCharTypeInfo) {
            return "'" + value.toString() + "'";
        } else if (typeInfo.getTypeName().equals(serdeConstants.BINARY_TYPE_NAME)) {
            byte[] bytes = (byte[]) value;
            char[] hexChars = new char[bytes.length * 2];
            for (int j = 0; j < bytes.length; j++) {
                int v = bytes[j] & 0xFF;
                hexChars[j * 2] = hexArray[v >>> 4];
                hexChars[j * 2 + 1] = hexArray[v & 0x0F];
            }
            return new String(hexChars);
        }
        return value.toString();
    }

    @Override
    public String getExprString() {
        if (typeInfo.getCategory() == Category.PRIMITIVE) {
            return getFormatted(typeInfo, value);
        } else if (typeInfo.getCategory() == Category.STRUCT) {
            StringBuilder sb = new StringBuilder();
            sb.append("const struct(");
            List<?> items = (List<?>) getWritableObjectInspector().getWritableConstantValue();
            List<TypeInfo> structTypes = ((StructTypeInfo) typeInfo).getAllStructFieldTypeInfos();
            for (int i = 0; i < structTypes.size(); i++) {
                final Object o = (i < items.size()) ? items.get(i) : null;
                sb.append(getFormatted(structTypes.get(i), o)).append(",");
            }
            sb.setCharAt(sb.length() - 1, ')');
            return sb.toString();
        } else {
            // unknown type
            return toString();
        }
    }

    @Override
    public ExprNodeDesc clone() {
        return new ExprNodeConstantDesc(typeInfo, value);
    }

    @Override
    public boolean isSame(Object o) {
        if (!(o instanceof ExprNodeConstantDesc)) {
            return false;
        }
        ExprNodeConstantDesc dest = (ExprNodeConstantDesc) o;
        if (!typeInfo.equals(dest.getTypeInfo())) {
            return false;
        }
        if (value == null) {
            if (dest.getValue() != null) {
                return false;
            }
        } else if (!value.equals(dest.getValue())) {
            return false;
        }

        return true;
    }

    @Override
    public int hashCode() {
        int superHashCode = super.hashCode();
        HashCodeBuilder builder = new HashCodeBuilder();
        builder.appendSuper(superHashCode);
        builder.append(value);
        return builder.toHashCode();
    }
}