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/*******************************************************************************
* Copyright (c) 2010 Cloudsmith Inc. and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cloudsmith Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.metadata.expression;
import org.eclipse.equinox.internal.p2.metadata.expression.Member.DynamicMember;
import org.eclipse.equinox.p2.metadata.Version;
import org.eclipse.equinox.p2.metadata.expression.IExpressionVisitor;
/**
* The abstract base class for all binary operations
*/
public abstract class Binary extends Expression {
public final Expression lhs;
public final Expression rhs;
protected Binary(Expression lhs, Expression rhs) {
this.lhs = lhs;
this.rhs = rhs;
}
public boolean accept(IExpressionVisitor visitor) {
return super.accept(visitor) && lhs.accept(visitor) && rhs.accept(visitor);
}
public int compareTo(Expression e) {
int cmp = super.compareTo(e);
if (cmp == 0) {
Binary be = (Binary) e;
cmp = lhs.compareTo(be.lhs);
if (cmp == 0)
cmp = rhs.compareTo(be.rhs);
}
return cmp;
}
public boolean equals(Object o) {
if (super.equals(o)) {
Binary bo = (Binary) o;
return lhs.equals(bo.lhs) && rhs.equals(bo.rhs);
}
return false;
}
public int getPriority() {
return PRIORITY_BINARY; // Default priority
}
public int hashCode() {
int result = 31 + lhs.hashCode();
return 31 * result + rhs.hashCode();
}
public void toString(StringBuffer bld, Variable rootVariable) {
appendOperand(bld, rootVariable, lhs, getPriority());
bld.append(' ');
bld.append(getOperator());
bld.append(' ');
appendOperand(bld, rootVariable, rhs, getPriority());
}
/**
* Appends the LDAP filter attribute name from the lhs expression if
* possible.
* @throws UnsupportedOperationException when this expression does not conform to an
* LDAP filter binary expression
*/
void appendLDAPAttribute(StringBuffer buf) {
if (lhs instanceof DynamicMember) {
DynamicMember attr = (DynamicMember) lhs;
if (attr.operand instanceof Variable) {
buf.append(attr.getName());
return;
}
}
throw new UnsupportedOperationException();
}
private static char hexChar(int value) {
return (char) (value < 10 ? ('0' + value) : ('a' + (value - 10)));
}
static void appendLDAPEscaped(StringBuffer bld, String str) {
appendLDAPEscaped(bld, str, true);
}
static void appendLDAPEscaped(StringBuffer bld, String str, boolean escapeWild) {
int top = str.length();
for (int idx = 0; idx < top; ++idx) {
char c = str.charAt(idx);
if (!escapeWild) {
if (c == '*') {
bld.append(c);
continue;
} else if (c == '\\' && idx + 1 < top && str.charAt(idx + 1) == '*') {
bld.append("\\2a"); //$NON-NLS-1$
++idx;
continue;
}
}
if (c == '(' || c == ')' || c == '*' || c == '\\' || c < ' ' || c > 127) {
short cs = (short) c;
bld.append('\\');
bld.append(hexChar((cs & 0x00f0) >> 4));
bld.append(hexChar(cs & 0x000f));
} else
bld.append(c);
}
}
/**
* Appends the LDAP filter value from the rhs expression if
* possible.
* @throws UnsupportedOperationException when this expression does not conform to an
* LDAP filter binary expression
*/
void appendLDAPValue(StringBuffer buf) {
if (rhs instanceof Literal) {
Object value = rhs.evaluate(null);
if (value instanceof String || value instanceof Version) {
appendLDAPEscaped(buf, value.toString());
return;
}
}
throw new UnsupportedOperationException();
}
}
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