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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchlib.expression;
import com.yahoo.text.Utf8;
import com.yahoo.vespa.objects.Deserializer;
import com.yahoo.vespa.objects.ObjectVisitor;
import com.yahoo.vespa.objects.Serializer;
/**
* This result holds a string.
*
* @author baldersheim
* @author Simon Thoresen Hult
*/
public class StringResultNode extends SingleResultNode {
// The global class identifier shared with C++.
public static final int classId = registerClass(0x4000 + 53, StringResultNode.class);
private static StringResultNode negativeInfinity = new StringResultNode("");
private static PositiveInfinityResultNode positiveInfinity = new PositiveInfinityResultNode();
// The string value of this node.
private String value;
/**
* Constructs an empty result node. <b>NOTE:</b> This instance is broken until non-optional member data is set.
*/
public StringResultNode() {
super();
value = "";
}
/**
* Constructs an instance of this class with given value.
*
* @param value The value to assign to this.
*/
public StringResultNode(String value) {
super();
setValue(value);
}
/**
* Sets the value of this result.
*
* @param value The value to set.
* @return This, to allow chaining.
*/
public StringResultNode setValue(String value) {
if (value == null) {
throw new IllegalArgumentException("Value can not be null.");
}
this.value = value;
return this;
}
@Override
protected int onGetClassId() {
return classId;
}
@Override
protected void onSerialize(Serializer buf) {
byte[] raw = getRaw();
buf.putInt(null, raw.length);
buf.put(null, raw);
}
@Override
protected void onDeserialize(Deserializer buf) {
value = getUtf8(buf);
}
@Override
public long getInteger() {
try {
return Integer.valueOf(value);
} catch (java.lang.NumberFormatException e) {
return 0;
}
}
@Override
public double getFloat() {
try {
return Double.valueOf(value);
} catch (java.lang.NumberFormatException e) {
return 0;
}
}
@Override
public String getString() {
return value;
}
@Override
public byte[] getRaw() {
return Utf8.toBytes(value);
}
@Override
protected int onCmp(ResultNode rhs) {
return (rhs instanceof PositiveInfinityResultNode)
? -1
: value.compareTo(rhs.getString());
}
@Override
public int hashCode() {
return super.hashCode() + value.hashCode();
}
@Override
public void visitMembers(ObjectVisitor visitor) {
super.visitMembers(visitor);
visitor.visit("value", value);
}
public void add(ResultNode rhs) {
value += rhs.getString();
}
public void min(ResultNode rhs) {
if (value.compareTo(rhs.getString()) > 0) {
value = rhs.getString();
}
}
public void max(ResultNode rhs) {
if (value.compareTo(rhs.getString()) < 0) {
value = rhs.getString();
}
}
public void append(ResultNode rhs) {
value += rhs.getString();
}
@Override
public Object getValue() {
return getString();
}
@Override
public void set(ResultNode rhs) {
value = rhs.getString();
}
@Override
public void negate() {
char a[] = value.toCharArray();
for (int i = 0; i < a.length; i++) {
a[i] = (char)-a[i];
}
value = new String(a);
}
/**
* Will provide the smallest possible value
*
* @return the smallest possible IntegerResultNode
*/
public static StringResultNode getNegativeInfinity() {
return negativeInfinity;
}
/**
* Will provide the largest possible value
*
* @return the smallest largest IntegerResultNode
*/
public static PositiveInfinityResultNode getPositiveInfinity() {
return positiveInfinity;
}
}
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